Congolite (original) (raw)

A valid IMA mineral species

About CongoliteHide

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Formula:

(Fe2+,Mg)3(B7O13)Cl

Name:

Named by E. Wendling, R.V. Hodenberg, and R. Kühn in 1972 after the country where the mineral was first discovered, the Republic of Congo (Brazzaville).

Unique IdentifiersHide

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Long-form identifier:

mindat:1:1:1118:7

34de3e83-6ce8-46b0-95e5-12da015d8290

IMA Classification of CongoliteHide

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Type description reference:

Classification of CongoliteHide

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6.GA.10

6 : BORATES
G : Heptaborates and other megaborates
A : Tekto-heptaborates

25.6.2.1

25 : ANHYDROUS BORATES CONTAINING HYDROXYL OR HALOGEN
6 : Hexaborates

10.1.19

10 : Borates with other anions
1 : Borates with halide

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 CongoliteHide

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Density:

3.58 g/cm3 (Measured) 3.52 g/cm3 (Calculated)

Optical Data of CongoliteHide

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RI values:

_n_ω = 1.755 _n_ε = 1.731

δ = 0.024

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

Chemistry of CongoliteHide

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Mindat Formula:

(Fe2+,Mg)3(B7O13)Cl

Crystallography of CongoliteHide

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Class (H-M):

3_m_ - Ditrigonal Pyramidal

Cell Parameters:

a = 8.62 Å, c = 21.05 Å

Unit Cell V:

1,354.56 ų (Calculated from Unit Cell)

Crystal StructureHide

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X-Ray Powder DiffractionHide

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Powder Diffraction Data:

Geological EnvironmentHide

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Type Occurrence of CongoliteHide

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General Appearance of Type Material:

Place of Conservation of Type Material:

Geological Setting of Type Material:

Reference:

Wendling, E., Hodenberg, R.V., Kühn, R. (1972) Congolit, der trigonale eisenboracit. Kali und Steinsalz: 6: 1-3.

Synonyms of CongoliteHide

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Other Language Names for CongoliteHide

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Relationship of Congolite to other SpeciesHide

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Other Members of this group:

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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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 CongoliteHide

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References for CongoliteHide

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Localities for CongoliteHide

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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.