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It crystallizes in the tetragonal system, in the form of square tabular crystals, and with distinct cleavage on {011}. It crystals also display transparency and adamantine luster. The X-ray diffraction data, calculated cell dimensions, constants and optic axial angles of the synthetic wulfenite are consistent with those of the natural mineral.
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Pyrrhotite generally displays massive to granular crystal habit, and may show tabular/prismatic or hexagonal crystals which are sometimes iridescent. [ 14 ] Diagnostic characteristics in hand sample include: brassy/bronze color with a grey/black streak, tabular or hexagonal crystals which show iridescence, subconchoidal fracture , metallic ...
Abernathyite is a transparent, yellow mineral that occurs as tabular crystals up to 3 millimeters (0.12 in). The mineral has a single perfect cleavage on . Abernathyite fluoresces yellow-green in longwave and shortwave ultraviolet. [4] Because of its uranium content, the mineral is radioactive. [5]
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Shigaite occurs as hexagonal tabular crystals up to 2 cm (0.79 in) in size or as thin films and coatings. The mineral can be yellow, burnt orange, brown or black in color. [ 5 ] Shigaite occurs in metamorphosed deposits of manganese ore [ 5 ] and is the Mn 2+ analogue of motukoreaite .
Strictly speaking, the word refers to a growth habit that is slender and tapering to a point. Prismatic crystals are not acicular; however, colloquial usage has altered the commonly understood meaning of the word. When writing for mineralogical publications, authors should restrict their usage of "acicular" to crystals with the tapering growth ...
Eskebornite was first identified in 1949 by Paul Ramdohr in the Eskaborn Adit, Tilkerode (), Harz, Saxony-Anhalt, Germany, [6] which it was also named after. It is often found with other selenides, including clausthalite, tiemannite, berzelianite, naumannite, umangite, geffroyite, and chaméanite, but also with other minerals like chalcopyrite, uraninite, ankerite, and dolomite.