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).

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Unique IdentifiersHide

Mindat ID:

862

Long-form identifier:

mindat:1:1:862:8

GUID
(UUID V4):

72f6933d-e8d8-436d-9f33-0e3526daeed9

IMA Classification of CalclaciteHide

IMA status:

Approved, 'Grandfathered' (first described prior to 1959)

Classification of CalclaciteHide

Strunz-mindat (2024):

10.AA.25

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

Dana 8th ed.:

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

Mineral SymbolsHide

As of 2021 there are now IMA–CNMNC approved mineral symbols (abbreviations) for each mineral species, useful for tables and diagrams.

Symbol	Source	Reference
Calc	IMA–CNMNC	Warr, L.N. (2021). IMA–CNMNC approved mineral symbols. Mineralogical Magazine, 85(3), 291-320. doi:10.1180/mgm.2021.43

Physical Properties of CalclaciteHide

Lustre:

Silky

Transparency:

Translucent

Comment:

Lustre silky in aggregates.

Colour:

White

Streak:

White

Comment:

Not determined

Density:

1.5 g/cm³ (Measured) 1.55 g/cm³ (Calculated)

Optical Data of CalclaciteHide

Type:

Biaxial (+)

RI values:

n_α = 1.468 n_β = 1.484 n_γ = 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

Chemistry of CalclaciteHide

Mindat Formula:

Ca(CH₃COO)Cl · 5H₂O

Elements listed:

C, Ca, Cl, H, O - search for minerals with similar chemistry

Crystallography of CalclaciteHide

Crystal System:

Monoclinic

Class (H-M):

2/m - Prismatic

Space Group:

P2₁/b

Cell Parameters:

a = 11.51 Å, b = 13.72 Å, c = 6.82 Å
β = 116.7°

Ratio:

a:b:c = 0.839 : 1 : 0.497

Unit Cell V:

962.16 Å³ (Calculated from Unit Cell)

Morphology:

Crystals as slky, hairlike efflorescences.

Comment:

Space Group determined on synthetic material.

Crystal StructureHide

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Data courtesy of the American Mineralogist Crystal Structure Database. Click on an AMCSD ID to view structure

ID	Species	Reference	Link	Year	Locality	Pressure (GPa)	Temp (K)
0019021	Calclacite	Giuseppetti G, Tadini C, Ungaretti L (1970) La struttura cristallina della calclacite Periodico di Mineralogia 39 145-158		1970	synthetic	0	293

CIF Raw Data - click here to close

data_global
_chemical_name_mineral 'Calclacite'
loop_
_publ_author_name
'Giuseppetti G'
'Tadini C'
'Ungaretti L'
_journal_name_full 'Periodico di Mineralogia'
_journal_volume 39 
_journal_year 1970
_journal_page_first 145
_journal_page_last 158
_publ_section_title
;
 La struttura cristallina della calclacite
;
_database_code_amcsd 0019021
_chemical_compound_source 'Synthetic'
_chemical_formula_sum 'Ca C2 O7 Cl H10'
_cell_length_a 6.82
_cell_length_b 13.72
_cell_length_c 11.51
_cell_angle_alpha 90
_cell_angle_beta 116.7
_cell_angle_gamma 90
_cell_volume 962.157
_exptl_crystal_density_diffrn      1.530
_symmetry_space_group_name_H-M 'P 1 21/c 1'
loop_
_space_group_symop_operation_xyz
  'x,y,z'
  'x,1/2-y,1/2+z'
  '-x,1/2+y,1/2-z'
  '-x,-y,-z'
loop_
_atom_site_label
_atom_site_fract_x
_atom_site_fract_y
_atom_site_fract_z
_atom_site_U_iso_or_equiv
Ca   0.17900   0.02810   0.40780   0.02090
C(1)   0.61910   0.05420   0.32820   0.02647
C(2)   0.52440   0.10290   0.19870   0.05269
O(1)   0.49530   0.02660   0.37810   0.04028
O(2)   0.17690  -0.03980   0.61140   0.03597
Cl   0.14240  -0.16590   0.03050   0.04737
WatO(3)   0.03380   0.01620  -0.16940   0.04471
WatO(4)   0.09670   0.17910   0.28830   0.05737
WatO(5)   0.27630   0.16950   0.55710   0.05117
WatO(6)   0.22560  -0.14780   0.38490   0.05269
WatO(7)   0.34210   0.15360   0.81560   0.05357
loop_
_atom_site_aniso_label
_atom_site_aniso_U_11
_atom_site_aniso_U_22
_atom_site_aniso_U_33
_atom_site_aniso_U_12
_atom_site_aniso_U_13
_atom_site_aniso_U_23
Ca 0.02012 0.02098 0.02464 0.00042 0.01270 0.00214
C(1) 0.01993 0.02861 0.03267 0.00127 0.01333 0.00429
C(2) 0.04720 0.07248 0.03910 0.01101 0.02000 0.02859
O(1) 0.03065 0.05340 0.04178 -0.00127 0.02063 0.01072
O(2) 0.04100 0.03242 0.03482 0.00169 0.01746 0.00643
Cl 0.05134 0.04005 0.04660 0.00466 0.01841 -0.00715
WatO(3) 0.04589 0.04673 0.04446 0.00466 0.02285 -0.00429
WatO(4) 0.06958 0.03815 0.04767 -0.00423 0.01143 0.01644
WatO(5) 0.06601 0.03433 0.05035 -0.00635 0.02380 -0.00643
WatO(6) 0.07090 0.02670 0.06481 -0.00254 0.03428 -0.00643
WatO(7) 0.05661 0.03910 0.05839 0.00254 0.02000 -0.00572

X-Ray Powder DiffractionHide

Powder Diffraction Data:

d-spacing	Intensity
8.27 Å	(strong)
3.24 Å	(strong)
2.43 Å	(strong)
6.87 Å	(medium)
4.16 Å	(medium)
2.30 Å	(medium)
6.15 Å	(weak)

Comments:

Synthetic. Data from van Tassel (1958). An alternate pattern, including orientation effects, is given in Voncken et al. (2001).

Geological EnvironmentHide

Paragenetic Mode(s):

Paragenetic Mode	Earliest Age (Ga)
Stage 7: Great Oxidation Event	<2.4
47g : [Halogen-bearing surface weathering minerals]
Stage 10b: Anthropogenic minerals	<10 Ka
57 : Other minerals formed by human processes

Other Language Names for CalclaciteHide

German:Calclacit

Spanish:Calclacita

Related Minerals - Strunz-mindat Grouping Hide

10.AA.	Stanevansite	Mg(C₂H₃O₃)₂ · 2H₂O	Mon. 2/m : P2₁/b
10.AA.	Jimkrieghite	Ca(C₂H₃O₃)₂	Orth. mmm (2/m 2/m 2/m) : Pbca
10.AA.	Lianbinite	(NH₄)(C₂H₃O₃)(C₂H₄O₃)	Mon. 2/m : P2₁/b
10.AA.	Glecklerite	Na(C₂H₃O₃)	Orth. mmm (2/m 2/m 2/m) : Pbcm
10.AA.05	Formicaite	Ca(HCOO)₂	Tet. 4 2 2 : P4₁ 2₁ 2
10.AA.10	Dashkovaite	Mg(HCOO)₂ · 2H₂O	Mon. 2/m : P2₁/b
10.AA.20	Acetamide	CH₃CONH₂	Trig. 3m : R3c
10.AA.30	Paceite	CaCu(CH₃COO)₄ · 6H₂O	Tet. 4/m : I4/m
10.AA.35	Hoganite	Cu(CH₃COO)₂ · H₂O	Mon. 2/m : B2/b
10.AA.40	Lazaraskeite	Cu(C₂H₃O₃)₂	Mon. 2/m : P2₁/m
10.AA.45	Marchettiite	C₅H₇N₅O₃	Tric. 1 : P1

Other InformationHide

Health Risks:

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

Internet Links for CalclaciteHide

mindat.org URL:

https://www.mindat.org/min-862.html
Please feel free to link to this page.

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External Links:

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Raman and XRD data at RRUFF project

References and PDF downloads at RRUFF project

American Mineralogist Crystal Structure Database

Handbook of Mineralogy page PDF

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References for CalclaciteHide

Reference List:

van Tassel, R. (1945) Une efflorescence d'acétatochlorure de calcium sur des roches calcaires dans des collections. Bulletin du Musée Royal d'Histoire Naturelle de Belgique, 21(26), 1-11.

Fleischer, M. (1947) New mineral names. American Mineralogist, 32, 254-255.

Palache, Charles, Berman, Harry, Frondel, Clifford (1951) The System of Mineralogy (7th ed.) Vol. 2 - Halides, Nitrates, Borates, Carbonates, Sulfates, Phosphates, Arsenates, Tungstates, Molybdates, Ect. John Wiley and Sons, New York.

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, 39, 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.

Voncken, J.H.L., Verkroost, T.W., van Tooren, M.M. (2001) New powder diffraction data on calclacite (CaClC2H3O2·5H2O). Neues Jahrbuch für Mineralogie, Monatshefte, 2001, 210-220.

Echigo, T., Kimata, M. (2010) Crystal chemistry and genesis of organic minerals: A review of oxalate and polycyclic aromatic hydrocarbon minerals. The Canadian Mineralogist, 48, 1329-1358.

Piro, O.E., Baran, E.J. (2018) Crystal chemistry of organic minerals-salts of organic acids: the synthetic approach. Crystallography Reviews, 24, 149-175.

virtualcollections.naturalsciences.be (n.d.) http://virtualcollections.naturalsciences.be/virtual-collections/geology/mineralogy/mineralogy-types/calclacite-rn5518

(2023) Calclacite. Handbook of Mineralogy. Mineralogical Society of America

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Calclacite

Unique IdentifiersHide

IMA Classification of CalclaciteHide

Classification of CalclaciteHide

Mineral SymbolsHide

Physical Properties of CalclaciteHide

Optical Data of CalclaciteHide

Chemistry of CalclaciteHide

Crystallography of CalclaciteHide

Crystal StructureHide

X-Ray Powder DiffractionHide

Geological EnvironmentHide

Other Language Names for CalclaciteHide

Related Minerals - Strunz-mindat GroupingHide

Other InformationHide

Internet Links for CalclaciteHide

References for CalclaciteHide

Related Minerals - Strunz-mindat Grouping Hide