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Topic: Polycrase

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	PoliKras" Galleries
		Polycrase xls in Frigstad, Iveland are relatively scarce.
		Xls having a deep dark - brown colour occur embedded in feldspar or quartz matrix..
		A single miniature with a main Polycrase xl of dark-brown colour on feldspar matrix.
	www.smartminerals.com /norvegia/Periklasl_1.htm (256 words)

	Dysprosium: Occurrence (Site not responding. Last check: 2007-11-01)
		Dysprosium is the most abundant of the heavier (yttrium group) lanthanide elements and is approximately as abundant as arsenic, hafnium and uranium.
		Fergusonite is found in Greenland, Norway, Sweden and USA and samarskite in Madagascar, North Carolina and Ontario.
		Polycrase is found in Norway, Sweden and North and South Carolina.
	nautilus.fis.uc.pt /st2.5/scenes-e/elem/e06620.html (130 words)

	MESOPROTEROZOIC POLYCRASE-TITANITE VEINS IN THE SULLIVAN PB-ZN-AG DEPOSIT, SOUTHEASTERN BRITISH COLUMBIA: MINERAL ...
		Subhedral polycrase grains (50-150 µm) contain both unaltered, oscillatory-zoned domains and altered, irregularly-zoned domains, all of which are variably replaced by titanite+albite+calcite +chlorite±allanite±epidote±thorite±pyrite±rutile.
		Limited SHRIMP ages for the titanite are 1.4-1.3 Ga and 1.0 Ga. The ages for the altered polycrase and titanite are consistent with mineral growth during the 1370-1320 Ma East Kootenay and the 1100-1000 Ma Grenvillian orogenies, both of which have been documented in the area by other geochronological studies.
		However, the 1415±5 Ma age for the unaltered polycrase records a previously unrecognized postore (<1470 Ma) and premetamorphic (>1370 Ma) hydrothermal event in the Sullivan deposit and vicinity.
	gsa.confex.com /gsa/2004AM/finalprogram/abstract_75822.htm (472 words)

	CJH Geochemistry and Petrology
		Pegmatites from the Tysfjord Region are the focus of a mineralogical and geochronological study.
		The pegmatites are enriched in a range of elements, including U, Th, P, Nd, Nb, F and contain many rare minerals such as polycrase, thorite and fergusonite, besides the less exotic phases plagioclase, fluorite, allanite, monazite and zircon..
		An ID-TIMS study of allanite, thorite, polycrase and fergusonite, and an electron-microprobe assisted chemical dating study of monazite provided consistent ages around 400 Ma.
	www.geo.umass.edu /faculty/hetherington/CJH_Geochemistry_and_Petrology.html (759 words)

	Nb-Ta oxide minerals from miarolitic pegmatites of the Baveno pink granite, NW Italy -- Aurisicchio et al. 65 (4): 509 ...
		X-ray data show that some oxides belong to the aeschynite mineral group; others are polycrase and fersmite.
		Aeschynite and polycrase are chemically heterogeneous and structurally disordered because of their metamict state.
		Epitaxial growth of aeschynite on polycrase (sample 3194) allows some inferences on the crystallization sequence.
	minmag.geoscienceworld.org /cgi/content/abstract/65/4/509 (428 words)

	Delos Toole, the Author
		Or that tantalite, or microlite, both ores of the element Tantalum are worth $$ a pound for the contained tungsten, and thus a 50% ore would be worth $$$$ per ton, and that some ores contain 80% tungsten?
		Or that columbite, samarskite, euxenite, or polycrase, all ores of the element Columbium, are now worth $$$$ a pound for the contained Columbium, and thus a 50% ore would be worth $$$$ a ton, and that some ores contain up to 82% Columbium as mined.
		Or that tantalite, or microlite, both ores of the element Tantalum, are now worth $$$ a pound for the contained Tantalum, and thus a 50% ore would be worth $$$$$ per ton, and that some ores may contain up to 86% Tantalum.
	www.delostooleauthor.com /fortune2.html (1080 words)

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