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Physical Properties of Atacamite
Cleavage:
{010} Perfect
Color:
Green, Yellow, Yellow green, Black green.
Density:
3.76 - 3.78, Average = 3.76
Diaphaneity:
Transparent to translucent
Fracture:
Conchoidal - Fractures developed in brittle materials characterized by smoothly curving surfaces, (e.g. quartz).
Habit:
Euhedral Crystals - Occurs as well-formed crystals showing good external form.
Habit:
Fibrous - Crystals made up of fibers.
Habit:
Granular - Generally occurs as anhedral to subhedral crystals in matrix.
Hardness:
3-3.5 - Calcite-Copper Penny
Luminescence:
Non-fluorescent.
Luster:
Adamantine
Streak:
apple green
Optical Properties of Atacamite
Gladstone-Dale:
CI meas= -0.024 (Excellent) - where the CI = (1-KPDmeas/KC) CI calc= -0.021 (Excellent) - where the CI = (1-KPDcalc/KC)
KPDcalc= 0.2268,KPDmeas= 0.2274,KC= 0.2221 Ncalc = 1.84
Optical Data:
Biaxial (-), a=1.831, b=1.861, g=1.88, bire=0.0490, 2V(Calc)=74, 2V(Meas)=75. Dispersion strong, r < v.
Calculated Properties of Atacamite
Electron Density:
Bulk Density (Electron Density)=3.61 gm/cc note: Specific Gravity of Atacamite =3.78 gm/cc.
Fermion Index:
Fermion Index = 0.0001100017 Boson Index = 0.9998899983
Photoelectric:
PEAtacamite = 27.37 barns/electron U=PEAtacamite x rElectron Density= 98.83 barns/cc.
Radioactivity:
GRapi = 0 (Gamma Ray American Petroleum Institute Units) Atacamite is Not Radioactive
Chemical Formula: 
