Formed from the weathering of b�hmite, pyrite, and calcite and occur as spherical aggregates that form pale brown strings in Eocene brown coal deposits. Dresserite group.
IMA Status:
Approved IMA 2004 (Dana # Added)
Locality:
M�ny coal deposit, Tatab�nya, Hungary Link to MinDat.org Location Data.
Name Origin:
Named after S�ndor Koch, (1896-1983), professor in the Department of Mineralogy, Petrography and Geochemistry Josef Atilla University.
Brittle - Generally displayed by glasses and most non-metallic minerals.
Habit:
Acicular - Occurs as needle-like crystals.
Habit:
Radial - Crystals radiate from a center without producing stellar forms (e.g. stibnite)
Hardness:
2-2.5 - Gypsum-Finger Nail
Luster:
Vitreous - Silky
Streak:
white
Optical Properties of Kochsandorite
Gladstone-Dale:
CI meas= -0.025 (Excellent) - where the CI = (1-KPDmeas/KC) CI calc= -0.028 (Excellent) - where the CI = (1-KPDcalc/KC)
KPDcalc= 0.2419,KPDmeas= 0.2414,KC= 0.2354 Ncalc = 1.58 - 1.59
Optical Data:
Biaxial (-), a=1.597, g=1.603, bire=0.0060
Calculated Properties of Kochsandorite
Electron Density:
Bulk Density (Electron Density)=2.52 gm/cc note: Specific Gravity of Kochsandorite =2.49 gm/cc.
Fermion Index:
Fermion Index = 0.0013035512 Boson Index = 0.9986964488
Photoelectric:
PEKochsandorite = 2.17 barns/electron U=PEKochsandorite x rElectron Density= 5.47 barns/cc.
Radioactivity:
GRapi = 0 (Gamma Ray American Petroleum Institute Units) Kochsandorite is Not Radioactive
Chemical Formula: 
