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Topic: Olivine

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In the News (Sun 21 Jul 19)

  OLIVINE (Magnesium Iron Silicate)
Olivine, however is not officially recognized as a mineral (see other non-minerals such as apophyllite, tourmaline, mica, serpentine, chlorite and apatite).
Olivine is found in ultramafic igneous rocks and marbles that formed from metamorphosed impure limestones.
Olivine can be altered to the mineral serpentine and this mineral is found in kimberlites, ophiolites and gabbros that started out with large amounts of olivine at one time.
mineral.galleries.com /minerals/silicate/olivine/olivine.htm   (869 words)

  Olivine - LoveToKnow 1911
Olivine is a common constituent of many basic and ultrabasic rocks, such as basalt, diabase, gabbro and peridotite: the dunite, of Dun Mountain near Nelson in New Zealand, is an almost pure olivine-rock.
Olivine is especially liable to alteration into serpentine (hydrated magnesium silicate); the alteration proceeds from the outside of the crystals and grains or along irregular cracks in their interior, and gives rise to the separation of iron oxides and an irregular net-work of fibrous serpentine, which in rock-sections presents a very characteristic appearance.
It occurs as nodules in a volcanic rock at Fayal in the Azores, and in granite - at the Mourne Mountains in Ireland; and as small crystals in cavities in rhyolite at the Yellowstone Park, U.S.A. It is a common constituent of crystalline iron slags.
www.1911encyclopedia.org /Olivine   (626 words)

DOUGLAS COUNTY: Olivine, altered to secondary mineral, is a common in the troctolite in the Buckley Quarry in the NW Sec.
IRON COUNTY: Olivine is widespread in small grains in the Keweenawan gabbroic and basaltic rocks in the county.
- Olivine occurs as tiny grains in nepheline syenite in the core zone of the Stettin pluton in the SW Sec.
www.uwrf.edu /~W1014120/olivine.htm   (848 words)

Olivine is sometimes called peridot [peary-doe] by jewelers.
Olivine is formed in igneous and metamorphic rocks.
Olivine has iron and magnesium in it and the amount of iron decides what color the stone will be.
library.thinkquest.org /05aug/00461/olivine.htm   (217 words)

 Olivine: World of Earth Science
The olivines are a class of common silicate minerals named for their greenish or olive color.
Olivine with 10–30% fayalite is defined as chrysolite; 30–50%, hyalosiderite; 50–70%, hortonolite; and 70–90%, ferrohortonite.
Olivine is readily altered to the mineral serpentine by the hydration of its crystal structure by hot (400–800°C) water.
science.enotes.com /earth-science/olivine   (423 words)

Olivine is a ferro-magnesian mineral that shows a complete compositional variation between forsterite (magnesium-rich) and fayalite (iron-rich).
Olivine is a rock-forming mineral, and occurs in igneous rocks with low silica, such as a gabbro, basalt, or dolerite.
*Olivine appears to be stable as a detrital mineral under the cold, dry conditions at the surface of Mars.
www.es.ucl.ac.uk /schools/Glossary/olivine.htm   (188 words)

 olivine - Encyclopedia.com
Transparent olivine of good color can be cut into gemstones; the gem form is known as peridot.
Sources of gem-quality olivine are St. John's Island in the Red Sea, Myanmar, and Arizona.
Magnesium-rich olivine has a high melting point and is used in the manufacture of refractories.
www.encyclopedia.com /doc.aspx?id=1E1:olivine   (222 words)

 Little Green Martian Mineral :: Astrobiology Magazine - earth science - evolution distribution Origin of life universe ...   (Site not responding. Last check: )
For olivine to be found in the soil may point to rock formation during a drier period in martian history.
Olivine is significant because it decomposes rapidly in the presence of water.
Olivine, a transparent green-colored mineral found in many volcanic regions, is susceptible to chemical weathering and readily alters to other minerals such as iddingsite, goethite, serpentine, chlorite, smectite, maghemite and hematite in the presence of water.
www.astrobio.net /news/article795.html   (1538 words)

 Olivine Mineral Data
Nord A G, Annersten H, Filippidis A, American Mineralogist, 67 (1982) p.1206-1211, The cation distribution in synthetic Mg-Fe-Ni olivines, sample H2 View Additional jPOWD Structure files for Olivine
Yellowish green, Olive green, Greenish fl, Reddish brown.
Print or Cut-and-Paste your Olivine Specimen Label here :
webmineral.com /data/Olivine.shtml   (190 words)

 purevolume™ | Olivine
Olivine are a 3-piece Alternative Rock band from the Blue Mountains, west of Sydney, Australia.
Influenced by such artists as Jeff Buckley, Incubus, Cog and A Perfect Circle, Olivine produce unique music which ranges from heavy rock riffs to jazz grooves.
Olivine perform shows throughout the greater Sydney region and are beginning to make a name for themselves both in the rock music and Christian music scene.
www.purevolume.com /olivine   (107 words)

 Olivine Summary   (Site not responding. Last check: )
Olivine occurs in both mafic and ultramafic igneous rocks, and as a primary mineral in certain metamorphic rocks.
Olivine is usually colored olive-green (hence the name), though it may alter to a reddish color from the oxidation of iron.
Olivine crystallizes from magma that is rich in magnesium and low in silica, which forms mafic to ultramafic rocks such as gabbro, basalt, peridotite, and dunite.
www.bookrags.com /Olivine   (1187 words)

Olivine, a basaltic mineral, is easily altered by aqueous solutions and its alteration assemblages may be specific to conditions of alteration [1].
It is vesicular and porphyritic, and its olivine grains altered to iddingsite along their edges and fractures.
Both Raman peaks of the olivine doublet (820 and 850 cm-1) broaden and weaken in proximity to the iddingsite while peak positions shift upwards.
epsc.wustl.edu /haskin-group/Raman/alt_olivine.htm   (389 words)

 USGS Spectroscopy Lab - Mars MGS TES Figure 1
Small white areas are low iron olivine, for example at the area labeled N (an area called Nili Fossae), and the rim of the crater Argyre, labeled A. The small magenta spots near the center of the image, labeled H, are coarse-grained iron oxide.
The olivine is not this extensive; the blue regions indicate where the olivine outcrops and not necessarily the exact shape of the outcrops.
The Nili Fossae area (labeled N on the map) is a large region of olivine outcrop and the solid white is approximately the correct size of the olivine zone.
speclab.cr.usgs.gov /mars.press.release.10.2000.html   (1544 words)

 olivine. The Columbia Encyclopedia, Sixth Edition. 2001-05
Transparent olivine of good color can be cut into gemstones; the gem form is known as peridot.
Sources of gem-quality olivine are St. John’s Island in the Red Sea, Myanmar, and Arizona.
Magnesium-rich olivine has a high melting point and is used in the manufacture of refractories.
www.bartleby.com /65/ol/olivine.html   (140 words)

Jewelers and birth-stone aficionados are familiar with the gem-quality olivine known as peridot.
An olivine crystal is normally a roundish lump 2 mm or less across.
Olivine's color ranges from the deep green of peridot to the olive green of olives to the pale olive green of pale green olives.
www.pitt.edu /~cejones/GeoImages/1Minerals/1IgneousMineralz/Olivine.html   (221 words)

 CVO Website - Olivine, Peridote, Dunite   (Site not responding. Last check: )
Olivine is a silicate mineral containing iron and magnesium.
In harzburgite and dunite, the olivine is brown, greenish brown to fl and has a more glassy texture than the pyroxene.
Olivine is used as a refactory liner in kilns and heating furnaces.
vulcan.wr.usgs.gov /LivingWith/VolcanicPast/Notes/olivine.html   (375 words)

Olivine is a bixial orthorhombic mineral with a very high refractive index and high relief.
This image is of a small misaligned piece of olivine in the center of a larger, crystolographically homogeneous mineral.
Olivine has an interference figure similar to aragonite, except with fewer isochromes (the colored fringes), and the isogyres are farther apart.
www.mtholyoke.edu /~mpeterso/classes/phys301/projects2001/pajudge/olivine.html   (737 words)

 Mars Odyssey Mission THEMIS: Discoveries
Because olivine decomposes easily when wet, its survival from ancient times suggests Mars has been cold and dry for much of its history.
Olivine is a common green volcanic mineral that breaks down rapidly in contact with water.
Finding abundant, unweathered olivine in rocks and loose sediments that old says that little groundwater or surface water has touched the rock since it formed.
themis.asu.edu /discoveries-olivine   (416 words)

 OLIVINE - Online Information article about OLIVINE
time thought to be crystals of serpentine, really consist of serpentine pseudomorphous after olivine.
Many of the large rock-masses of serpentine have been derived by the serpentinization of olivine-rocks.
zinc; they all crystallize in the orthorhombic system, and are isomorphous with olivine.
encyclopedia.jrank.org /NUM_ORC/OLIVINE.html   (796 words)

Within the 504 intervals, again neglecting the seams, the principal variations in the olivine gabbro suite are in grain size and percentage of olivine.
In many parts of the core, several consecutive intervals of medium- to coarse-grained olivine gabbro, leaving out the oxide-gabbro seams, are bounded by fine-grained olivine gabbro, fine-grained troctolitic gabbro, or fine-grained troctolite, using the terminology of Leg 176.
Each alternation of coarse-grained olivine gabbro and finer-grained, more olivine-rich gabbro or troctolite beneath it, combining two or more composite intervals, can be treated as a potential individual injection or series of pulses of magma that contributed to the thickness of the crust of Hole 735B at any one place in the section.
www-odp.tamu.edu /publications/176_SR/synth/s_6.htm   (1540 words)

 Olivine   (Site not responding. Last check: )
Olivine is a silicate mineral with the general composition (Mg,Fe)
Though not abundant in continental rocks, olivine is yet thought to be a major component of the upper mantle of the Earth.
Part of the basis for this presumption is the fact that it is one of the first minerals to crystallize from molten magma.
hyperphysics.phy-astr.gsu.edu /hbase/geophys/olivine.html   (177 words)

 Olivine   (Site not responding. Last check: )
Forsterite and olivine are incompatible with free silica because they react with it to give pyroxene; as a consequence, olivine and quartz cannot crystallize together in a rock.
Olivine is typically a mineral of mafic and ultramafic igneous rocks; in some places, it constitutes major rock masses (dunite); some basalts contain nodules of granular olivine, some that are derived from the earth’s mantle.
Olivine is a common mineral in stony and stony-iron meteorites.
geology.csupomona.edu /alert/mineral/olivine.htm   (347 words)

 PSRD: Olivine on Mars
Olivine is the common name for a suite of iron-magnesium silicate minerals known to crystallize first from a magma and to weather first in the presence of water into clays or iron oxides.
Hence, the shapes, positions, and depths of the olivine fundamental bands were used to map the distribution of olivine compositions on the Martian surface.
Olivine composition mapped in the Nili Fossae region.
www.psrd.hawaii.edu /Nov03/olivine.html   (2063 words)

 NASA - Top Story
Olivine composition mapped in the Nili Fossae region on Mars.
Olivine, a transparent, green-colored mineral found in many rocks containing magnesium and iron (mafic igneous rocks), is highly susceptible to chemical weathering and readily alters to other minerals in the presence of liquid water (minerals such as iddingsite, goethite, serpentine, chlorite, smectite, maghemite and hematite).
The fact that so much olivine is exposed at the surface in the Nili Fossae region indicates that there has been little to no weathering due to water, thus no liquid water-mineral chemical reactions.
www.nasa.gov /centers/goddard/news/topstory/2003/1022olivine.html   (746 words)

 Geotimes - January 2004 - Green minerals on the Red Planet
The research team reports the discovery of a 30,000-square-kilometer expanse of olivine in the Nili Fossae region of Mars —; an area of fractures and down-dropped blocks of crust, called grabens, associated with the Isidis impact basin.
However, they acknowledge that the olivine could have been uncovered more recently by means of physical erosion and mass movements of materials.
The chemical composition of olivine varies along a series from forsterite, the magnesium end-member, to fayalite, the iron end-member.
www.geotimes.org /jan04/NN_marsolivine.html   (570 words)

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