Cedar Hill Quarry, Lancaster County, Pennsylvania, USA. Artinite locality and old talc prospect, 1 mile NE of Paicacho Peak, San Benito Co. California. Link to MinDat.org Location Data.
Name Origin:
Named after Paul E. Desautels (1920-1991), curator of minerals at the U. S. National Museum of Natural History (Smithstonian Institution).
Euhedral Crystals - Occurs as well-formed crystals showing good external form.
Habit:
Pseudo Hexagonal - Crystals show a hexagonal outline.
Hardness:
2 - Gypsum
Luminescence:
Non-fluorescent.
Luster:
Pearly
Streak:
light orange
Optical Properties of Desautelsite
Dichroism (e):
light orange.
Dichroism (w):
deep orange.
Gladstone-Dale:
CI meas= -0.087 (Poor) - where the CI = (1-KPDmeas/KC) CI calc= -0.107 (Poor) - where the CI = (1-KPDcalc/KC)
KPDcalc= 0.267,KPDmeas= 0.262,KC= 0.2411 Ncalc = 1.5 - 1.51
Optical Data:
Uniaxial (-), e=1.547, w=1.569, bire=0.0220.
Calculated Properties of Desautelsite
Electron Density:
Bulk Density (Electron Density)=2.17 gm/cc note: Specific Gravity of Desautelsite =2.13 gm/cc.
Fermion Index:
Fermion Index = 0.02 Boson Index = 0.98
Photoelectric:
PEDesautelsite = 4.67 barns/electron U=PEDesautelsite x rElectron Density= 10.13 barns/cc.
Radioactivity:
GRapi = 0 (Gamma Ray American Petroleum Institute Units) Desautelsite is Not Radioactive
Chemical Formula: 
