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Basso R , Palenzona A , Zefiro L , Neues Jahrbuch fur Mineralogie, Monatshefte , 1989 (1989) p.300-308, Crystal structure refinement of a Sr-bearing term related to copper, vanadates and arsenates of adelite and descloizite groups, Locality: Molinello mine, Val Graveglia, Northern Appenines, Eastern Liguria, Italy
Physical Properties of Tangeite
Cleavage:
{???} Perfect
Color:
Yellow, Yellow green, Olive green.
Density:
3.5
Diaphaneity:
Subtranslucent
Habit:
Granular - Generally occurs as anhedral to subhedral crystals in matrix.
Hardness:
3.5 - Copper Penny
Luminescence:
Non-fluorescent.
Luster:
Vitreous - Pearly
Magnetism:
Nonmagnetic
Optical Properties of Tangeite
Gladstone-Dale:
CI meas= -0.192 (Poor) - where the CI = (1-KPDmeas/KC) CI calc= -0.087 (Poor) - where the CI = (1-KPDcalc/KC)
KPDcalc= 0.2734,KPDmeas= 0.3,KC= 0.2516 Ncalc = 1.88 - 1.97