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Kochsándorite

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Coal Mine, Mány, Bicske-Zsámbéki Basin, Fejér Co., Hungary
© Elmar Lackner

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Formula:
CaAl
 
2
(CO
 
3
)
 
2
(OH)
 
4
 · H
 
2
O
System:OrthorhombicColour:Colourless
Hardness:2 - 2½
Name:
Named after Sándor Koch, former professor of mineralogy, petrography and geochemistry at the University of Szeged, Hungary.
This page provides mineralogical data about Kochsándorite.

Classification of Kochsándorite

IMA status:Approved 2004
Strunz 8th edition ID:5/E.0-
Strunz 9th edition ID:5.DB.
Nickel-Strunz 10th (pending) edition ID:5.DB.10

5 : CARBONATES (NITRATES)
D : Carbonates with additional anions, with H2O
B : With large and medium-sized cations
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Type Occurrence of Kochsándorite

Type Locality:Coal Mine, Mány, Bicske-Zsámbéki Basin, Fejér Co., Hungary
General Appearance of Type Material:Spherical aggregates of acicular crystals up to 0.5 mm long, forming strings in massive coal.
Geological Setting of type material:Coal mine
Associated Minerals at type locality:
QuartzPyriteKaoliniteIlliteGypsum
GibbsiteFelsőbányaiteDolomiteCoalCalcite
BöhmiteAlumohydrocalcite

Physical Properties of Kochsándorite

Lustre:Vitreous, Silky
Colour:Colourless
Comment:Larger aggregates are white to pale brown.
Streak:White
Hardness (Mohs):2 - 2½
Tenacity:Brittle
Cleavage:None Observed
Density (measured):2.486(20) g/cm3
Density (calculated):2.514(2) g/cm3

Crystallography of Kochsándorite

Crystal System:Orthorhombic
Class (H-M):mmm (2/m 2/m 2/m) - Dipyramidal
Space Group:Pnma {P21/n 21/m 21/a}
Cell Parameters:a = 15.564(6) Å, b = 5.591(4) Å, c = 9.112(4) Å
Ratio:a:b:c = 2.784 : 1 : 1.63
Unit Cell Volume:V 792.9 ų
Z:4
Morphology:Forms, in order of prominence: {100}, {110}, {001} and {010}.

Optical Data of Kochsándorite

Type:Biaxial (-)
RI values: nα = 1.597(3) nγ = 1.603(6)
Maximum Birefringence:δ = 0.006

Chart shows birefringence interference colour range (at 30µm thickness) and does not take into account mineral colouration.
Surface Relief:Moderate
Pleochroism:Non-pleochroic

Chemical Properties of Kochsándorite

Formula:
CaAl
 
2
(CO
 
3
)
 
2
(OH)
 
4
 · H
 
2
O
Essential elements:Al, C, Ca, H, O
All elements listed in formula:Al, C, Ca, H, O

Relationship of Kochsándorite to other Species

Related Minerals - Nickel-Strunz Grouping):

- +
5.DB.05Alumohydrocalcite
CaAl
 
2
(CO
 
3
)
 
2
(OH)
 
4
 · 3H
 
2
O
5.DB.05Nasledovite
PbMn
 
3
Al
 
4
(CO
 
3
)
 
4
(SO
 
4
)O
 
5
 · 5H
 
2
O
5.DB.05Para-alumohydrocalcite
CaAl
 
2
(CO
 
3
)
 
2
(OH)
 
4
 · 6H
 
2
O
5.DB.05UM1977-02-CO:AlCaH
Ca
 
3
Al
 
2
(CO
 
3
)
 
3
O
 
6
 · 32H
 
2
O
5.DB.10Dresserite
BaAl
 
2
(CO
 
3
)
 
2
(OH)
 
4
 · H
 
2
O
5.DB.10Dundasite
PbAl
 
2
(CO
 
3
)
 
2
(OH)
 
4
 · H
 
2
O
5.DB.10Montroyalite
Sr
 
4
Al
 
8
(CO
 
3
)
 
3
(OH,F)
 
26
 · 10-11H
 
2
O
5.DB.10Strontiodresserite
(Sr,Ca)Al
 
2
(CO
 
3
)
 
2
(OH)
 
4
 · H
 
2
O
5.DB.10Petterdite
PbCr
3+
2
(CO
 
3
)
 
2
(OH)
 
4
 · H
 
2
O
5.DB.15Hydrodresserite
BaAl
 
2
(CO
 
3
)
 
2
(OH)
 
4
 · 3H
 
2
O
5.DB.20Schuilingite-(Nd)
PbCu(Nd,Gd,Sm,Y)(CO
 
3
)
 
3
(OH) · 1.5H
 
2
O
5.DB.25Sergeevite
Ca
 
2
Mg
 
11
(CO
 
3
)
 
13
 · 10H
 
2
O
5.DB.30Szymańskiite
Hg
 
16
(Ni,Mg)
 
6
(CO
 
3
)
 
12
(OH)
 
12
 · 11H
 
2
O

Other Names for Kochsándorite

Synonyms:
IMA2004-037
Other Languages:
German:Kochsandorit

Other Information

Health Warning:No information on health risks for this material has been entered into the database. You should always treat mineral specimens with care.

References for Kochsándorite

Reference List:

- +
Sajó, I.E. & Szakáll, S. (2007): Kochsándorite, a new Ca–Al carbonate mineral from the Mány coal deposit, Hungary. Canadian Mineralogist 45, 479-483.

Internet Links for Kochsándorite

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    • Localities for Kochsándorite

    Hide Locality List
    (TL) indicates type locality. ? indicates mineral may be doubtful at this locality. All other localities listed without reference should be considered as uncertain and unproven until references can be found.
    Hungary
     
    • Fejér Co.
      • Bicske-Zsámbéki Basin
        • Mány
    		Sajó, I.E. & Szakáll, S. (2007): Canadian Mineralogist 45, 479-483. Sajó, István & Szakáll, Sándor: Geoda, 2007 dec.
    • Komárom-Esztergom Co.
      • Gerecse Mts.
        • Tatabánya
    		Geoda/2007/1
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