Kochsandorite Mineral Data

[Localities] [Carat Weight] [Special Collections] [Diamond Lots] [Ordering Info]
See Also: [Excalibur Minerals] [Mineral News] [Hudson Institute] [Minerals on CDROM]
Special Collections of Rough Diamonds for Researchers and Collectors
Unparalled diversity of specimens from different locations

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: Mány coal field, Tatabánya, 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 - Google Images
4 - Google Scholar
5 - MinDAT
6 - MinMax(Deutsch)
7 - MinMax(English)
8 - Mineralienatlas (Deutsch)
9 - QUT Mineral Atlas
10 - Ruff.Info

Search for Kochsandorite using:

[ALTAVISTA] [AOL] [All-The-Web] [HotBot] [Ixquick] [MAMMA] [MSN.COM] [Netscape] [Scirus] [Teoma] [Wikipedia] [YAHOO]

Visit our Advertisers for Kochsandorite :

AA Mineral Specimens

B & L Fine Minerals

Crystalarium.com

Dan Weinrich Fine Minerals

Dan Weinrich Auctions

Dakota Matrix

Desert Winds Gems and Minerals

John Betts Fine Minerals

Mason's Minerals

Mineral News

Mineral of the Month Club

Wrights Rock Shop

Translate Kochsandorite Mineral Data :

Ask about Kochsandorite here :
Ask-A-Mineralogist from the Mineralogical Society of America
Mindat.org's Discussion Groups
Original Rockhounds Discussion Group
Rockhounds Discussion Group on Yahoo Groups
Mineral Discussion Forum from Fabre Minerals - also available in Español

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: