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⇱ Calciotantite: Mineral information, data and localities.

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Calciotantite

A valid IMA mineral species
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About CalciotantiteHide

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Formula:
CaTa4O11
Colour:
Colorless
Lustre:
Adamantine
Hardness:
6½
Specific Gravity:
7.46
Crystal System:
Hexagonal
Name:
The name alludes to the CALCIum content and its chemical relationship to TANTITE.
See also the discredited ungursaite.


Unique IdentifiersHide

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Mindat ID:
834
Long-form identifier:
mindat:1:1:834:5

IMA Classification of CalciotantiteHide

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Approved
First published:
1982

Classification of CalciotantiteHide

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4.DJ.05

4 : OXIDES (Hydroxides, V[5,6] vanadates, arsenites, antimonites, bismuthites, sulfites, selenites, tellurites, iodates)
D : Metal: Oxygen = 1:2 and similar
J : With large (+- medium-sized) cations; polyhedral frameworks
8.6.2.1

8 : MULTIPLE OXIDES CONTAINING NIOBIUM,TANTALUM OR TITANIUM
6 : (AB)6O11·nH2O
18.1.9

18 : Niobates and Tantalates
1 : Niobates and tantalates containing neither rare earths nor U

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.

SymbolSourceReference
CtanIMA–CNMNCWarr, L.N. (2021). IMA–CNMNC approved mineral symbols. Mineralogical Magazine, 85(3), 291-320. doi:10.1180/mgm.2021.43

Physical Properties of CalciotantiteHide

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Adamantine
Transparency:
Transparent
Colour:
Colorless
Streak:
White
Hardness:
6½ on Mohs scale
Hardness:
VHN20=1200 kg/mm2 - Vickers
Cleavage:
None Observed
Density:
7.46 g/cm3 (Measured)    6.735 g/cm3 (Calculated)
Comment:
(Nb rich) to 7.40

Optical Data of CalciotantiteHide

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Type:
Uniaxial
Reflectivity:
WavelengthR1 (%)R2 (%)
486nm16.9% 16.3%
551nm17.0% 16.6%
589nm17.1% 16.7%
656nm18.2% 18.0%


Graph shows reflectance levels at different wavelengths (in nm). Peak reflectance is 18.2%.
R1 shown in black, R2 shown in

Chemistry of CalciotantiteHide

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Mindat Formula:
CaTa4O11
Element Weights:
Element% weight
Ta77.010 %
O18.725 %
Ca4.264 %

Calculated from ideal end-member formula.

Crystallography of CalciotantiteHide

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Crystal System:
Hexagonal
Class (H-M):
622 - Trapezohedral
Space Group:
P6322
Cell Parameters:
a = 6.2261(6) Å, c = 12.280(1) Å
Ratio:
a:c = 1 : 1.972
Unit Cell V:
412.25 ų (Calculated from Unit Cell)
Z:
2

Crystal StructureHide

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Data courtesy of the American Mineralogist Crystal Structure Database. Click on an AMCSD ID to view structure
IDSpeciesReferenceLinkYearLocalityPressure (GPa)Temp (K)
0015587CalciotantiteYamnova N A, Pushcharovsky D Yu, Voloshin A V (1988) Identity of ungursaite with calciotantite and synthetic CaTa4O11 Soviet Physics Crystallography 33 498-4991988Kola Peninsula, Russia0293
0005632CalciotantiteCooper M A, Hawthorne F C, Cerny P (1999) Ta-Nb order in the crystal structure of niobium-rich calciotantite The Canadian Mineralogist 37 1289-1294👁 Image
19990293
CIF Raw Data - click here to close

X-Ray Powder DiffractionHide

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Powder Diffraction Data:
d-spacingIntensity
3.02 Å(100)
1.508 Å(100)
2.78 Å(90)
3.15 Å(70)
1.793 Å(70)
1.551 Å(70)
2.47 Å(60)

Geological EnvironmentHide

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Paragenetic Mode(s):
Paragenetic ModeEarliest Age (Ga)
Stage 4b: Highly evolved igneous rocks>3.0
34 : Complex granite pegmatites

Type Occurrence of CalciotantiteHide

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General Appearance of Type Material:
Calciotantite occurs as square to rectangular to hexagonal crystals 0.03-0.05 mm as inclusions in microlite or as veinlets 0.1-0.3 mm in microlite.
Place of Conservation of Type Material:
Geology Museum, Kola Branch, Academy of Sciences, Apatity, number 5702/1.
A.E. Fersman Mineralogical Museum, Academy of Sciences, Moscow, Russia, number 81392.
Geological Setting of Type Material:
In the albite-spodumene zone of granite pegmatites.
Associated Minerals at Type Locality:

Synonyms of CalciotantiteHide

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Other Language Names for CalciotantiteHide

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Relationship of Calciotantite to other SpeciesHide

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Other Members of Natrotantite Group:
IrtyshiteNa2(Ta,Nb)4O11Hex.
NatrotantiteNa2Ta4O11Trig. 3m(32/m) : R3c

Common AssociatesHide

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Associated Minerals Based on Photo Data:
1 photo of Calciotantite associated with StibiotantaliteSb(Ta,Nb)O4
1 photo of Calciotantite associated with Microlite GroupA2-mTa2X6-wZ-n
1 photo of Calciotantite associated with Tantalite-(Mn)Mn2+Ta2O6

Related Minerals - Strunz-mindat GroupingHide

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4.DJ.05IrtyshiteNa2(Ta,Nb)4O11Hex.
4.DJ.05NatrotantiteNa2Ta4O11Trig. 3m(32/m) : R3c

Fluorescence of CalciotantiteHide

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Other InformationHide

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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 CalciotantiteHide

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mindat.org URL:
https://www.mindat.org/min-834.html
Please feel free to link to this page.

References for CalciotantiteHide

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Localities for CalciotantiteHide

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

Locality ListHide

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👁 Image
- This locality has map coordinates listed. 👁 Image
- This locality has estimated coordinates. ⓘ - Click for references and further information on this occurrence. ? - Indicates mineral may be doubtful at this locality. 👁 Image
- Good crystals or important locality for species. 👁 Image
- 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.
Australia
  • Western Australia
    • Port Hedland Shire
      • Abydos Station
        • Wodgina
Sweetapple et al. (2001)
DR Congo
  • Tanganyika
Voloshin A.V. (1988)
Kazakhstan
  • East Kazakhstan Region
    • Irtysh River
Pekov (1998)
Russia (TL)
  • Murmansk Oblast
    • Voron'i Tundry
Voloshin et al. (1982) +1 other reference
Sweden
  • Stockholm County
    • Haninge
      • Utö
        • Utö Mines
Smeds et al. (1999) +1 other reference
Cooper +1 other reference
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To cite: Ralph, J., Von Bargen, D., Martynov, P., Zhang, J., Que, X., Prabhu, A., Morrison, S. M., Li, W., Chen, W., & Ma, X. (2025). Mindat.org: The open access mineralogy database to accelerate data-intensive geoscience research. American Mineralogist, 110(6), 833–844. doi:10.2138/am-2024-9486.
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