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Harlow G E , Hawthorne F C , American Mineralogist , 93 (2008) p.1545-1549, Herderite from Mogok, Myanmar, and comparison with hydroxyl-herderite from, Ehrenfriedersdorf, Germany, Locality: Sauberg mine, Morgenrother Zug, Ehrenfriedersdorf, Germany, Note: 20517, Note: Occupancies derived from X-ray diffraction analysis
Physical Properties of Herderite
Cleavage:
{110} Indistinct
Color:
White, Yellowish white, Greenish white.
Density:
3
Diaphaneity:
Transparent to Translucent
Fracture:
Sub Conchoidal - Fractures developed in brittle materials characterized by semi-curving surfaces.
Hardness:
5 - Apatite
Luminescence:
Non-fluorescent.
Luster:
Vitreous (Glassy)
Streak:
white
Optical Properties of Herderite
Gladstone-Dale:
CI meas= -0.043 (Good) - where the CI = (1-KPDmeas/KC) CI calc= -0.04 (Good) - where the CI = (1-KPDcalc/KC)
KPDcalc= 0.2019,KPDmeas= 0.2026,KC= 0.1942 Ncalc = 1.58