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Merlino S , Science , 166 (1969) p.1399-1401, Tuhualite crystal structure, Locality: Mayor Island, New Zealand, Note: Position of H2O not determined in paper
Physical Properties of Tuhualite
Cleavage:
{100} Good, {010} Good, {001} Good
Color:
Blue violet, Dark blue, Black.
Density:
2.89
Fracture:
Brittle - Generally displayed by glasses and most non-metallic minerals.
Hardness:
3-4 - Calcite-Fluorite
Streak:
reddish gray
Optical Properties of Tuhualite
Gladstone-Dale:
CI meas= 0.035 (Excellent) - where the CI = (1-KPDmeas/KC) CI calc= 0.038 (Excellent) - where the CI = (1-KPDcalc/KC)
KPDcalc= 0.2116,KPDmeas= 0.2123,KC= 0.22 Ncalc = 1.64