Uranium also does not usually form very insoluble mineral species, which is a further factor in the wide variety of geological conditions and places in which uranium mineralization may accumulate.
42.
It is noted as the most important site in Britain for secondary ore minerals of lead, copper, and arsenic and has had 40 mineral species recorded at the site.
43.
Named after Charles Alfred Anderson ( 1902 1990 ) of the United States Geological Survey, who first described the mineral species, it is found in sandstone-hosted uranium deposits.
44.
Nowadays, deposition of the type material in a professionally curated museum is required by the Commission on New Minerals, Nomenclature and Classification of the IMA when approving a new mineral species.
45.
Hydrated forms of the compound occur naturally as three mineral species : whewellite ( monohydrate, known from some coal beds ), weddellite ( dihydrate ) and a very rare trihydrate called caoxite.
46.
On the other hand, imperfect single crystals can reach enormous sizes in nature : several mineral species such as beryl, gypsum and feldspars are known to have produced crystals several metres across.
47.
After John Parry and F . E . Wright described the mineral afwillite in 1925, Williams recognized that his samples of bultfonteinite were not natrolite, but were likely a new mineral species.
48.
It is however impossible to quantify the mineralogy of pegmatite in simple terms because of their varied mineralogy and difficulty in estimating the modal abundance of mineral species which are of only a trace amount.
49.
Prior to 1997, stilbite was recognized as a mineral species, but a reclassification in 1997 by the International Mineralogical Association changed it to a series name, with the mineral species being named:
50.
Prior to 1997, stilbite was recognized as a mineral species, but a reclassification in 1997 by the International Mineralogical Association changed it to a series name, with the mineral species being named:
