Calcite Group

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Siderite
Poudrette quarry (Demix quarry; Uni-Mix quarry; Desourdy quarry; Carrière Mont Saint-Hilaire), Mont Saint-Hilaire, Rouville RCM, Montérégie, Québec, Canada
© Rob Lavinsky

Show Calcite Group Photos (19271)

Formula:

AXO

Name:

After the principal species in the group.

Calcite group structures are taken by nitrates and carbonates of relatively small cations, including Li, Na, Mg, Ca, Fe²⁺, Zn, Co²⁺, and Cd.

The structure of calcite and its related species is ionic and resembles that of NaCl, the place of the spherical Cl ions being taken by planar (CO₃)^2- or (NO₃)^1- groups. These groups are arranged in parallel position in the crystal with their threefold symmetry axes oriented along [0001]. This arrangement leads to the strong birefringence of calcite-group minerals.

Classification of Calcite Group

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Chemical Properties of Calcite Group

Formula:

AXO

Chemical Analyses of Calcite Group

Analysis :

	1
CaO :	56.037%
CO₂ :	43.963%
Totals :	100%

Localities :

1 -- Ideal Composition

Notes :

1 -- ;

Relationship of Calcite Group to other Species

Group Members:

CaCO

(Ni,Mg,Fe)CO

MgCO

CdCO

MnCO

FeCO

ZnCO

CoCO

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 Calcite Group

Reference List:

- +

Bragg W.L. (1914) Proceedings of the Royal Society, London: 89A: 468.

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: Halides, Nitrates, Borates, Carbonates, Sulfates, Phosphates, Arsenates, Tungstates, Molybdates, Etc. John Wiley and Sons, Inc., New York, 7th edition, revised and enlarged: 141-142.