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Nakai I , Okada H , Masutomi K , Koyama E , Nagashima K , American Mineralogist , 71 (1986) p.1236-1239, Henmilite, Ca2Cu(OH)4[B(OH)4]2, a new mineral from Fuka, Okayama Prefecture,, Japan. II. Crystal structure
Physical Properties of Henmilite
Color:
Bluish violet.
Density:
2.51
Diaphaneity:
Transparent
Fracture:
Fragile - Crystals with a delicate and easily injured structure.
Habit:
Microscopic Crystals - Crystals visible only with microscopes.
Hardness:
1.5-2 - Talc-Gypsum
Luster:
Vitreous (Glassy)
Streak:
pale violet
Optical Properties of Henmilite
Gladstone-Dale:
CI meas= 0.001 (Superior) - where the CI = (1-KPDmeas/KC) CI calc= 0.005 (Superior) - where the CI = (1-KPDcalc/KC)
KPDcalc= 0.2392,KPDmeas= 0.2401,KC= 0.2404 Ncalc = 1.6 - 1.61