Hanawaltite

General Information:
 Chemical Formula:
Hg+6Hg++[Cl,(OH)]2O3
 Composition:
(Molecular Weight = 1,513.81 gm)
Mercury 92.75 % Hg
Hydrogen 0.03 % H 
Chlorine 3.51 % Cl
Oxygen 3.70 % O 
 Empirical Formula:
Hg6HgCl1.5(OH)0.5O3
 Environment:
On a fracture surface in a brecciated silica-carbonate rock composed mainly of ferroan magnesite and quartz.
 IMA Status:
Approved IMA
 Locality:
Clear Creek claim, New Idria district, San Benito County, California, USA.
 Name Origin:
For Dr. J. Donald Hanawalt (1903-1987), a pioneer in the field of X-ray powder diffraction.
Physical Properties:
 Cleavage:
[001] Good
 Color:
black, dark brown black, or dark red brown.
 Density:
9.52
 Diaphaniety:
Opaque to translucent
 Habits:
Anhedral Grains - Granular minerals without the expression of crystal shapes, ,
 Hardness:
4 - Fluorite
 Luminescence:
Non-fluorescent.
 Luster:
Metallic
 Streak:
dark reddish black
More details...