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Calclacite

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Formula:
Ca(CH3COO)Cl · 5H2O
System:
Monoclinic
Colour:
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

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.
10.AA.25

10 : ORGANIC COMPOUNDS
A : Salts of organic acids
A : Formates, Acetates, etc.
50.2.4.1

50 : ORGANIC COMPOUNDS
2 : Mellitates, Citrates, Cyanates, Acetates and Formates
31.4.1

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

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

Crystallography of Calclacite

Crystal System:
Monoclinic
Class (H-M):
2/m - Prismatic
Space Group:
P21/b
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°
Max Birefringence:
δ = 0.047
Image 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(CH3COO)Cl · 5H2O
Essential elements:
All elements listed in formula:

Relationship of Calclacite to other Species

10.AA.05FormicaiteCa(HCOO)2
10.AA.10DashkovaiteMg(HCOO)2 · 2H2O
10.AA.20AcetamideCH3CONH2
10.AA.30PaceiteCaCu(CH3COO)4 · 6H2O
10.AA.35HoganiteCu(CH3COO)2 · H2O

Other Names for Calclacite

Name in Other Languages:
German:Calclacit
Spanish:Calclacita

Other Information

Health Risks:
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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