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Calclacite

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Formula:
Ca(CH
 
3
COO)Cl · 5H
 
2
O
System:MonoclinicColour:White
Name:In allusion to its composition, containing CALcium, chlorine (CL) and ACetate.


Calcium chloride acetate pentahydrate.

A mineral which forms on calcareous rock and fossil specimens and pottery shards through the interaction of acetic acid derived from oak museum storage cabinets (anthropogenic).

Classification of Calclacite

IMA status:Valid - first described prior to 1959 (pre-IMA) - "Grandfathered"
Explanation of status:No genuinely natural occurrence documented. Found on specimens of limestone in wooden drawers.
Strunz 8th edition ID:9/A.02-20
Nickel-Strunz 10th (pending) edition ID:10.AA.25

10 : ORGANIC COMPOUNDS
A : Salts of organic acids
A : Formates, Acetates, etc.
Dana 8th edition ID:50.2.4.1

50 : ORGANIC COMPOUNDS
2 : Mellitates, Citrates, Cyanates, Acetates and Formates
Hey's CIM Ref.:31.4.1

31 : Oxalates, Citrates, Mellitates and Acetates
4 : Acetates
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Physical Properties of Calclacite

Lustre:Silky
Diaphaneity (Transparency):Translucent
Comment:Lustre silky in aggregates.
Colour:White
Comment:Not determined
Density (measured):1.5 g/cm3
Density (calculated):1.55 g/cm3

Crystallography of Calclacite

Crystal System:Monoclinic
Class (H-M):2/m - Prismatic
Space Group:P21/b {P1 1 21/b} {P21/c} {P1 21/c 1} {P21/a}
Cell Parameters:a = 11.51Å, b = 13.72Å, c = 6.82Å
β = 116.7°
Ratio:a:b:c = 0.839 : 1 : 0.497
Unit Cell Volume:V 962.16 ų (Calculated from Unit Cell)
Z:4
Morphology:Crystals as slky, hairlike efflorescences.
Comment:Space Group determined on synthetic material.

Optical Data of Calclacite

Type:Biaxial (+)
RI values: nα = 1.468 nβ = 1.484 nγ = 1.515
2V:Measured: 80° , Calculated: 74°
Maximum Birefringence:δ = 0.047

Chart shows birefringence interference colour range (at 30µm thickness) and does not take into account mineral colouration.
Surface Relief:Moderate
Dispersion:relatively weak

Chemical Properties of Calclacite

Formula:
Ca(CH
 
3
COO)Cl · 5H
 
2
O
Simplified for copy/paste:Ca(CH3COO)Cl·5H2O
Essential elements:C, Ca, Cl, H, O
All elements listed in formula:C, Ca, Cl, H, O

Relationship of Calclacite to other Species

Related Minerals - Nickel-Strunz Grouping):

- +
10.AA.05Formicaite
Ca(HCOO)
 
2
10.AA.10Dashkovaite
Mg(HCOO)
 
2
· 2H
 
2
O
10.AA.20Acetamide
CH
 
3
CONH
 
2
10.AA.30Paceite
CaCu(CH
 
3
COO)
 
4
· 6H
 
2
O
10.AA.35Hoganite
Cu(CH
 
3
COO)
 
2
· H
 
2
O

Other Names for Calclacite

Other Languages:
German:Calclacit
Spanish:Calclacita

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 Calclacite

Reference List:

- +
van Tassel (1945) Musée royale d’histoire naturelle de Belgique, Bulletin: 21: 1.

American Mineralogist (1947): 32: 254.

Palache, C., Berman, H., & Frondel, C. (1951), The System of Mineralogy of James Dwight Dana and Edward Salisbury Dana, Yale University 1837-1892, Volume II. John Wiley and Sons, Inc., New York, 7th edition, revised and enlarged, 1124 pp.: 1107.

Van Tassel, R. (1958) On the crystallography of calclacite, Ca(CH3COO)Cl•5H2O. Acta Crystallographica: 11: 745–746.

Giuseppetti G., Tadini C., Ungaretti L. (1970) - La struttura cristallina della calclacite. Periodico di mineralogia – Roma, pp. 145-158.

Giuseppetti G., Tadini C., Ungaretti L. (1972) - La struttura cristallina di una fase triclina del composto corrispondente alla calclacite Ca(CH3COO)Cl*5H2O. Periodico di mineralogia – Roma: 9-21.

Internet Links for Calclacite

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