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McDonald A M , Grice J D , Chao G Y , The Canadian Mineralogist , 38 (2000) p.649-656, The crystal structure of yoshimuraite, a layered Ba-Mn-Ti silicophosphate,, with comments on five-coordinated Ti
Physical Properties of Yoshimuraite
Cleavage:
{010} Perfect, {101} Distinct, {101} Distinct
Color:
Orange brown.
Density:
4.13
Fracture:
Brittle - Generally displayed by glasses and most non-metallic minerals.
Hardness:
4.5 - Between Fluorite and Apatite
Optical Properties of Yoshimuraite
Gladstone-Dale:
CI meas= 0.04 (Good) - where the CI = (1-KPDmeas/KC) CI calc= 0.065 (Fair) - where the CI = (1-KPDcalc/KC)
KPDcalc= 0.1828,KPDmeas= 0.1877,KC= 0.1954 Ncalc = 1.81 - 1.83