Lustre (mineralogy)

Lustre (mineralogy) - Factbites
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Topic: Lustre (mineralogy)

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	MINERALOGY - LoveToKnow Article on MINERALOGY
		The degrees of intensity of lustre are described as splendent, shining, glistening, glimmering and dull, and depend usually on the smoothness of the crystal-faces.
		Synthesis of MineralsThe production of minerals by artificial means is a branch of chemical mineralogy which has been pursued with considerable success, especially by French chemists.
		For example, calcite, with its three directions of perfect cleavage parallel to the faces of a rhombohedron, may always be readily distinguished from aragonite or quartz; or again, the perfect cubical cleavage of galena renders this mineral always easy of recognition.
	14.1911encyclopedia.org /M/MI/MINERALOGY.htm

	MINERALOGY - Online Information article about MINERALOGY
		Non-essential characters—such as colour, lustre, hardness, form and structure of aggregates--depend largely on the presence of impurities, or on the state of aggregation of imperfectly formed crystalline individuals.
		It was then recognized that chemical composition and crystalline form were characters of the first importance, and that external (natural history) characters were often more or less accidental.
		relating to chemical composition, crystalline form, crystallo-physical properties and specific gravity; these are identical, or vary only within certain defined limits, in all specimens of the same mineral-species.
	encyclopedia.jrank.org /MIC_MOL/MINERALOGY.html (1296 words)

	Mineralogy of Gads Hill, Tasmania
		The most common form occurs as colourless to grey, yellow, or brown globular spherules with a pearly lustre.
		The latter trip provided specimens of chabazite, phillipsite, thomsonite and calcite, all of which were recorded by Anderson, and, in addition, a few specimens of analcite were found, the first time that this mineral has been reported from this location.
		There are also two rarer forms, the first as white curved wisps on globular thomsonite, the second as white fibrous masses usually stretching across vesicles with fibres branching out in a number of directions.
	www.crocoite.com /mainadit/gadshill.htm (1296 words)

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Topic: Lustre (mineralogy)

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In the News (Mon 7 Dec 09)