In silicate and carbonate cavities and in nepheline syenite pegmatites.
IMA Status:
Approved IMA 1997
Locality:
Poudrette quarry, Mont Saint-Hilaire, Rouville County, Quebec, as well as in the Corporation quarry, Montreal, Quebec, Canada. Link to MinDat.org Location Data.
Name Origin:
Named after Steve Cares (1909-) and Janet Cares (1921-) of Sudbury, MA, Canada, who found the mineral.
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Physical Properties of Caresite
Cleavage:
{001} Perfect
Color:
Colorless, Yellow, Orange brown.
Density:
2.57 - 2.59, Average = 2.58
Diaphaneity:
Transparent
Fracture:
Brittle - Generally displayed by glasses and most non-metallic minerals.
Habit:
Prismatic - Crystals Shaped like Slender Prisms (e.g. tourmaline).
Habit:
Tabular - Form dimensions are thin in one direction.
Hardness:
2 - Gypsum
Luster:
Vitreous (Glassy)
Streak:
white
Optical Properties of Caresite
Gladstone-Dale:
CI meas= 0.033 (Excellent) - where the CI = (1-KPDmeas/KC) CI calc= 0.044 (Good) - where the CI = (1-KPDcalc/KC)
KPDcalc= 0.2239,KPDmeas= 0.2266,KC= 0.2343 Ncalc = 1.6 - 1.61
Optical Data:
Uniaxial (-), e=1.57, w=1.599, bire=0.0290.
Calculated Properties of Caresite
Electron Density:
Bulk Density (Electron Density)=2.58 gm/cc note: Specific Gravity of Caresite =2.58 gm/cc.
Fermion Index:
Fermion Index = 0.0084113378 Boson Index = 0.9915886622
Photoelectric:
PECaresite = 11.27 barns/electron U=PECaresite x rElectron Density= 29.11 barns/cc.
Radioactivity:
GRapi = 0 (Gamma Ray American Petroleum Institute Units) Caresite is Not Radioactive
Chemical Formula: 