Calkinsite-(Ce) (original) (raw)

A valid IMA mineral species - grandfathered

About Calkinsite-(Ce)Hide

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Formula:

(Ce,La)2(CO3)3 · 4H2O

Crystal System:

Orthorhombic

Name:

Named calkinsite by W.T. Pecora and J.H. Kerr in honor of Frank Cathcart Calkins (7 June 1878, East Rockport, Ohio, USA – 1974), geologist with the U.S. Geological Survey. The suffix "-(Ce)" designates the dominant rare earth element in the composition and was added to the name in 1987.

This page provides mineralogical data about Calkinsite-(Ce).

Unique IdentifiersHide

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Long-form identifier:

mindat:1:1:867:3

b8a13ecd-8d98-4027-a283-6a1b7645629a

IMA Classification of Calkinsite-(Ce)Hide

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

IMA Formula:

Ce2(CO3)3 · 4H2O

Type description reference:

Classification of Calkinsite-(Ce)Hide

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5.CC.25

5 : CARBONATES (NITRATES)
C : Carbonates without additional anions, with H2O
C : With rare earth elements (REE)

15.4.1.1

15 : HYDRATED NORMAL CARBONATES
4 : AmBn(XO3)p·xH2O, with (m+n):p < 1:1

11.8.1

11 : Carbonates
8 : Carbonates of the rare earths

Mineral SymbolsHide

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

Physical Properties of Calkinsite-(Ce)Hide

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Cleavage:

Perfect
{010} perfect, {101} distinct

Density:

3.28(1) g/cm3 (Measured)

Optical Data of Calkinsite-(Ce)Hide

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RI values:

_n_α = 1.569 _n_β = 1.657 _n_γ = 1.686

2V:

Measured: 54° , Calculated: 56°

δ = 0.117

Image shows birefringence interference colour range (at 30µm thickness)
and does not take into account mineral colouration.

Dispersion:

r > v or r < v

Optical Extinction:

X = b; Y = c; Z = a.

Comments:

X:b (yellow), Y:c (colorless), Z:a (colorless)

Chemistry of Calkinsite-(Ce)Hide

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Mindat Formula:

(Ce,La)2(CO3)3 · 4H2O

Crystallography of Calkinsite-(Ce)Hide

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Crystal System:

Orthorhombic

Cell Parameters:

a = 9.57(2) Å, b = 12.65(8) Å, c = 8.94(2) Å

Ratio:

a:b:c = 0.757 : 1 : 0.707

Unit Cell V:

1,082.28 ų (Calculated from Unit Cell)

Comment:

space group P21 221 or D32. class P2/m 2/m 2/m

X-Ray Powder DiffractionHide

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Powder Diffraction Data:

Geological EnvironmentHide

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Type Occurrence of Calkinsite-(Ce)Hide

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General Appearance of Type Material:

platy habit parallel to {010 }

Place of Conservation of Type Material:

U. S. National Museum, Washington, D. C.

Geological Setting of Type Material:

occur in shonkinite, mafic monzonite, and syenite

Associated Minerals at Type Locality:

Reference:

Pecora, W.T., Kerr, J.H. (1953) Burbankite and calkinsite, two new carbonate minerals from Montana. American Mineralogist: 38: 1169-1183.

Common AssociatesHide

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Associated Minerals Based on Photo Data:

Related Minerals - Strunz-mindat GroupingHide

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Other InformationHide

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Notes:

Effervesces strongly in cold dilute (1:5) HCl.

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 Calkinsite-(Ce)Hide

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References for Calkinsite-(Ce)Hide

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Localities for Calkinsite-(Ce)Hide

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This map shows a selection of localities that have latitude and longitude coordinates recorded. Click on the symbol to view information about a locality. The symbol next to localities in the list can be used to jump to that position on the map.

Locality ListHide

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- This locality has map coordinates listed. - This locality has estimated coordinates. ⓘ - Click for references and further information on this occurrence. ? - Indicates mineral may be doubtful at this locality. - Good crystals or important locality for species. - World class for species or very significant. (TL) - Type Locality for a valid mineral species. (FRL) - First Recorded Locality for everything else (eg varieties). Struck out - Mineral was erroneously reported from this locality. Faded * - Never found at this locality but inferred to have existed at some point in the past (e.g. from pseudomorphs).

All localities listed without proper references should be considered as questionable.