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analcime
Science; General science
A mineral with a framework structure in which all the aluminosilicate tetrahedral vertices are linked, thus allying it to the feldspars, feldspathoids, and zeolites. The structure ...
wolframite
Science; General science
A mineral with chemical composition (Fe,Mn)WO 4 , intermediate between ferberite, the iron tungstate, and huebnerite, the manganese tungstate, which form a complete solid solution ...
barite
Science; General science
A mineral with chemical composition BaSO 4 . It is isostructural with celestite, SrSO 4 , and anglesite, PbSO 4 . Barite is orthorhombic, space group Pnma, a = 0.887 ...
cryolite
Science; General science
A mineral with chemical composition Na 3 AlF 6 . Although it crystallizes in the monoclinic system, cryolite has three directions of parting at nearly 90°, giving it a ...
cerargyrite
Science; General science
A mineral with composition AgCl (see illus. ). Its structure is that of the isometric NaCl type, but well-formed cubic crystals are rare. The hardness is 2.5 on Mohs scale and ...
zincite
Science; General science
A mineral with composition ZnO (zinc oxide). It crystallizes in the hexagonal system with a wurtzite-type structure. Thus its principal axis is polar and different forms appear ...
anhydrite
Science; General science
A mineral with the chemical composition CaSO 4 . Anhydrite occurs commonly in white and grayish granular masses, rarely in large, orthorhombic crystals (see illus. ). Fracture ...
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