Congolite

Congolite, etc.

Boulby Mine, Loftus, Redcar and Cleveland, North Yorkshire, England, UK

Congolite

Boulby Mine, Loftus, Redcar and Cleveland, North Yorkshire, England, UK

Congolite

Potash Corporation of Saskatchewan Mine, Penobsquis, Cardwell Parish, Kings Co., New Brunswick, Canada

Congolite, etc.

Boulby Mine, Loftus, Redcar and Cleveland, North Yorkshire, England, UK

Congolite

Boulby Mine, Loftus, Redcar and Cleveland, North Yorkshire, England, UK

Congolite

Potash Corporation of Saskatchewan Mine, Penobsquis, Cardwell Parish, Kings Co., New Brunswick, Canada

Congolite, etc.

Boulby Mine, Loftus, Redcar and Cleveland, North Yorkshire, England, UK

Congolite

Boulby Mine, Loftus, Redcar and Cleveland, North Yorkshire, England, UK

About CongoliteHide

Flag of the Republic of the Congo

Formula:

(Fe²⁺,Mg)₃(B₇O₁₃)Cl

Colour:

Pale red, pink

Hardness:

6½ - 7½

Specific Gravity:

3.58

Crystal System:

Trigonal

Member of:

Boracite Group

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).

Type Locality:

ⓘ Kouilou Department, Republic of the Congo

Dimorph of:

Ericaite

Boracite Group. The Fe2+ analogue of Trembathite. The trigonal dimorph of Ericaite.

Unique IdentifiersHide

IMA Classification of CongoliteHide

Classification of CongoliteHide

Mineral SymbolsHide

Physical Properties of CongoliteHide

Optical Data of CongoliteHide

Type:

Uniaxial (-)

RI values:

n_ω = 1.755 n_ε = 1.731

Max Birefringence:

δ = 0.024

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

Surface Relief:

High

Chemistry of CongoliteHide

Crystallography of CongoliteHide

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)
0019541	Congolite	Mendoza-Alvarez M E, Yvon K, Depmeier W, Schmid H (1985) Structure refinement of trigonal iron-chlorine boracite Acta Crystallographica C41 1551-1552		1985	synthetic	0	293
0010745	Congolite	Dowty E, Clark J R (1973) Crystal-structure refinements for orthorhombic boracite, Mg3B7O13Cl, and a trigonal, iron-rich analogue Zeitschrift fur Kristallographie 138 64-99		1973	Bischofferode, Thuringen, Germany	0	293

CIF Raw Data - click here to closedata_global _chemical_name_mineral 'Congolite' loop_ _publ_author_name 'Mendoza-Alvarez M E' 'Yvon K' 'Depmeier W' 'Schmid H' _journal_name_full 'Acta Crystallographica, Section C' _journal_volume 41 _journal_year 1985 _journal_page_first 1551 _journal_page_last 1552 _publ_section_title ; Structure refinement of trigonal iron-chlorine boracite ; _database_code_amcsd 0019541 _chemical_compound_source 'Synthetic' _chemical_formula_sum 'Fe3 Cl B7 O13' _cell_length_a 8.6231 _cell_length_b 8.6231 _cell_length_c 21.0503 _cell_angle_alpha 90 _cell_angle_beta 90 _cell_angle_gamma 120 _cell_volume 1355.551 _exptl_crystal_density_diffrn 3.577 _symmetry_space_group_name_H-M 'R 3 c' loop_ _space_group_symop_operation_xyz 'x,y,z' '2/3+x,1/3+y,1/3+z' '1/3+x,2/3+y,2/3+z' 'x,x-y,1/2+z' '2/3+x,1/3+x-y,5/6+z' '1/3+x,2/3+x-y,1/6+z' '-y,-x,1/2+z' '2/3-y,1/3-x,5/6+z' '1/3-y,2/3-x,1/6+z' '-x+y,y,1/2+z' '2/3-x+y,1/3+y,5/6+z' '1/3-x+y,2/3+y,1/6+z' '-y,x-y,z' '2/3-y,1/3+x-y,1/3+z' '1/3-y,2/3+x-y,2/3+z' '-x+y,-x,z' '2/3-x+y,1/3-x,1/3+z' '1/3-x+y,2/3-x,2/3+z' loop_ _atom_site_label _atom_site_fract_x _atom_site_fract_y _atom_site_fract_z _atom_site_U_iso_or_equiv Fe 0.14727 0.29642 0.32700 0.00692 Cl 0.00000 0.00000 0.26630 0.01217 Bl 0.16360 -0.16550 0.08261 0.00480 B2 0.10020 -0.10270 -0.02895 0.00450 B3 0.00000 0.00000 0.10180 0.00610 O1 0.00000 0.00000 -0.01215 0.00390 O21 -0.15930 -0.00080 0.10509 0.00500 O22 0.28880 0.25910 -0.03720 0.00460 O23 0.20030 -0.02310 -0.08789 0.00430 O24 -0.30450 -0.22460 0.02118 0.00460 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 Fe 0.00571 0.00817 0.00786 0.00412 0.00135 0.00319 Cl 0.01059 0.01059 0.01526 0.00531 0.00000 0.00000 Bl 0.00424 0.00480 0.00651 0.00311 0.00056 -0.00064 B2 0.00339 0.00452 0.00539 0.00170 0.00008 0.00008 B3 0.00509 0.00509 0.00808 0.00254 0.00000 0.00000 O1 0.00311 0.00311 0.00539 0.00155 0.00000 0.00000 O21 0.00223 0.00387 0.00808 0.00096 0.00048 -0.00072 O22 0.00322 0.00435 0.00561 0.00161 0.00056 -0.00096 O23 0.00438 0.00342 0.00359 0.00085 0.00088 -0.00008 O24 0.00494 0.00339 0.00449 0.00136 0.00096 0.00000

X-Ray Powder DiffractionHide

Geological EnvironmentHide

Type Occurrence of CongoliteHide

Synonyms of CongoliteHide

Other Language Names for CongoliteHide

Relationship of Congolite to other SpeciesHide

Common AssociatesHide

Related Minerals - Strunz-mindat GroupingHide

Other InformationHide

Internet Links for CongoliteHide

References for CongoliteHide

Localities for CongoliteHide

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

- 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.

Canada
New Brunswick Kings Co. Cardwell Parish ⓘ Penobsquis	Grice et al. (2005)
ⓘ Potash Corporation of Saskatchewan Mine (PCS Mine; Potash Corporation of America Mine)	Grice (2002)
Studholm Parish ⓘ Millstream deposit (Millstream property)	Grice et al. (2005)
Germany
Thuringia Eichsfeld District Am Ohmberg Bischofferode potash mine ⓘ Holungen shaft	Fleischer (1972)
Poland
Greater Poland Voivodeship Koło County Gmina Kłodawa ⓘ Kłodawa salt deposit	PIECZKA et al. (2012) +1 other reference
Republic of the Congo
Brazzaville Department ⓘ Brazzaville	American Mineralogist (1972)
ⓘ Kouilou Department (TL)	American Mineralogist (1972)
Russia
Perm Krai Solikamsky District Solikamsk Verkhnekamskoe K deposit Romanovskiy area ⓘ Borehole No. 2001	Zhitova et al. (2019)
UK
England North Yorkshire Redcar and Cleveland Loftus ⓘ Boulby Mine	Bart Cannon analyses