Kochsandorite Mineral Data

General Kochsandorite Information

Chemical Formula:

CaAl2(CO3)2(OH)4•H2O

Composition:

Molecular Weight = 295.50 gm

Calcium 12.21 % Ca 17.08 % CaO

Aluminum 18.26 % Al 34.50 % Al₂O₃

Hydrogen 2.25 % H 20.12 % H₂O

Carbon 7.72 % C 28.30 % CO₂

Oxygen 59.56 % O

______ ______

100.00 % 100.00 % = TOTAL OXIDE

Empirical Formula:

Ca_0.9Al₂(CO₃)_1.9(OH)₄•1.3(H₂O)

Environment:

Formed from the weathering of böhmite, 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:

Mány coal deposit, Tatabánya, Hungary Link to MinDat.org Location Data.

Name Origin:

Named after Sándor Koch, (1896-1983), professor in the Department of Mineralogy, Petrography and Geochemistry Josef Atilla University.

Synonym:

IMA2004-037

Kochsandorite Image

Images:

Kochsandorite

Comments: Pearly circles of radiating white microcrystals of kochsandorite on coal.
Location: Many coal deposit, Bicske-Zsambeki Basin, Tatabanya. Scale: 2.5x1.7x1.1 cm.
© Richard Dale / Dale Minerals

Images:

Kochsandorite

Comments: White fibers of kochandorite on coal-marl matrix.
Location: MÃ¡ny coal field, TatabÃ¡nya, Hungary. Scale: See Image.
© Jeff Weissman / Photographic Guide to Mineral Species

Kochsandorite Crystallography

Axial Ratios:

a:b:c =2.7837:1:1.6297

Cell Dimensions:

a = 15.564, b = 5.591, c = 9.112, Z = 4; V = 792.91 Den(Calc)= 2.48

Crystal System:

Orthorhombic - DipyramidalH-M Symbol (2/m 2/m 2/m) Space Group: P nma

$Help on X Ray Diffraction:$ X Ray Diffraction:

By Intensity(I/I_o): 5.9154(1)(201), 7.8607(0.87)(101), 4.3718(0.858)(102),7.783(0.678)(200), 2.957(0.476)(402), 2.9455(0.44)(501), 1.9021(0.257)(620), 2.5687(0.17)(502), 3.5772(0.149)(401),

Physical Properties of Kochsandorite

Cleavage:

None

Color:

White.

Density:

2.486

Diaphaneity:

Transparent

Fracture:

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:

PE_{Kochsandorite}= 2.17 barns/electron
U=PE_{Kochsandorite} x rElectron Density= 5.47 barns/cc.

Radioactivity:

GRapi = 0 (Gamma Ray American Petroleum Institute Units)
Kochsandorite is Not Radioactive

Kochsandorite Classification

Dana Class:

16b.02.01.05 (16b)Carbonates - Hydroxyl or Halogen

(16b.02)where (A)m (B)n (XO3)p Zq · x(H2O), with (m+n):p=3:2

(16b.02.01)Dundasite Group

16b.02.01.01 Dundasite PbAl2(CO3)2(OH)4•(H2O) Pbmm 2/m 2/m 2/m

16b.02.01.02 Dresserite BaAl2(CO3)2(OH)4•(H2O) Pbmm 2/m 2/m 2/m

16b.02.01.03 Strontiodresserite (Sr,Ca)Al2(CO3)2(OH)4•(H2O) Pbmm 2/m 2/m 2/m

16b.02.01.04 Petterdite! PbCr2(CO3)2(OH)4•H2O Pbnm 2/m 2/m 2/m

16b.02.01.05 Kochsandorite! CaAl2(CO3)2(OH)4•H2O P nma 2/m 2/m 2/m

Strunz Class:

05.DB.10 05 - CARBONATES (NITRATES)

05.D - Carbonates with Additional Anions, with H2O

05.DB -With large and medium-sized cations

05.DB.10 Dresserite BaAl2(CO3)2(OH)4•(H2O) Pbmm 2/m 2/m 2/m

05.DB.10 Dundasite PbAl2(CO3)2(OH)4•(H2O) Pbmm 2/m 2/m 2/m

05.DB.10 Kochsandorite! CaAl2(CO3)2(OH)4•H2O P nma 2/m 2/m 2/m

05.DB.10 Strontiodresserite (Sr,Ca)Al2(CO3)2(OH)4•(H2O) Pbmm 2/m 2/m 2/m

05.DB.10 Petterdite! PbCr2(CO3)2(OH)4•H2O Pbnm 2/m 2/m 2/m

Other Kochsandorite Information

References:

NAME( AmMin, v92:1777) PHYS. PROP.(AmMin, v92:1777) OPTIC PROP.(AmMin, v92:1777)

See Also:

Links to other databases for Kochsandorite :
1 - Am. Min. Crystal Structure Database
2 - Athena
3 - GeoScienceWorld
4 - Google Images
5 - Google Scholar
6 - MinDAT
7 - Mineralienatlas (Deutsch)
8 - Online Mineral Museum
9 - QUT Mineral Atlas
10 - Ruff.Info

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Print or Cut-and-Paste your Kochsandorite Specimen Label here :

Kochsandorite

CaAl2(CO3)2(OH)4•H2O
Dana No: 16b.02.01.05 Strunz No: 05.DB.10
Locality:

Notes: