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Brenkite

A valid IMA mineral species

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Photos of Brenkite (32)

Brenkite Gallery Search Photos of Brenkite

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Brenkite

Schellkopf, Brenk, Brohltal, Ahrweiler, Rhineland-Palatinate, Germany

Brenkite

Schellkopf, Brenk, Brohltal, Ahrweiler, Rhineland-Palatinate, Germany

Brenkite

Schellkopf, Brenk, Brohltal, Ahrweiler, Rhineland-Palatinate, Germany

Brenkite

Schellkopf, Brenk, Brohltal, Ahrweiler, Rhineland-Palatinate, Germany

Brenkite

Schellkopf, Brenk, Brohltal, Ahrweiler, Rhineland-Palatinate, Germany

Brenkite

Schellkopf, Brenk, Brohltal, Ahrweiler, Rhineland-Palatinate, Germany

Brenkite

Schellkopf, Brenk, Brohltal, Ahrweiler, Rhineland-Palatinate, Germany

Brenkite

Schellkopf, Brenk, Brohltal, Ahrweiler, Rhineland-Palatinate, Germany

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About BrenkiteHide

the interesting part is on the left upper zone in the rubble

Schellkopf, Brenk, Brohltal, Ahrweiler, Rhineland-Palatinate, Germany

Formula:

Ca₂(CO₃)F₂

Colour:

Colorless

Hardness:

Specific Gravity:

3.10

Crystal System:

Orthorhombic

Name:

Named for the type locality at Brenk, Germany.

Type Locality:

ⓘ Schellkopf, Brenk, Brohltal, Ahrweiler, Rhineland-Palatinate, Germany

This page provides mineralogical data about Brenkite.

Unique IdentifiersHide

Mindat ID:

764

Long-form identifier:

mindat:1:1:764:7

GUID
(UUID V4):

95d9cfd3-f2bf-4d4b-85fb-191b5627d31b

IMA Classification of BrenkiteHide

IMA status:

Approved

Approval year:

1977

Type description reference:

Hentschel, G., Leufer, U., Tillmanns, E. (1978): Brenkit, ein neues Kalzium-Fluor-Carbonat von Schellkopf/Eifel. N.Jb.Mineral., Mh, 1978, 325-329.

Classification of BrenkiteHide

Strunz-mindat (2024):

5.BC.05

5 : CARBONATES (NITRATES)
B : Carbonates with additional anions, without H₂O
C : With alkali-earth cations

Dana 8th ed.:

16a.3.6.1

16a : ANHYDROUS CARBONATES CONTAINING HYDROXYL OR HALOGEN
3 : (AB)₂(XO₃)Z_q

Hey's CIM Ref.:

12.1.6

12 : Carbonates with other anions
1 : Carbonates with halides

Mineral SymbolsHide

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

Symbol	Source	Reference
Bki	IMA–CNMNC	Warr, L.N. (2021). IMA–CNMNC approved mineral symbols. Mineralogical Magazine, 85(3), 291-320. doi:10.1180/mgm.2021.43

Physical Properties of BrenkiteHide

Transparency:

Translucent

Colour:

Colorless

Streak:

White

Hardness:

5 on Mohs scale

Cleavage:

None Observed

Density:

3.10(4) g/cm³ (Measured) 3.126 g/cm³ (Calculated)

Optical Data of BrenkiteHide

Type:

Biaxial (-)

RI values:

n_α = 1.525 n_β = 1.590 n_γ = 1.593

2V:

Measured: 26° to 28°, Calculated: 22°

Max Birefringence:

δ = 0.068

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

Surface Relief:

Moderate

Dispersion:

r > v

Optical Extinction:

X = a; Y = a.

Chemistry of BrenkiteHide

Mindat Formula:

Ca₂(CO₃)F₂

Elements listed:

C, Ca, F, O - search for minerals with similar chemistry

Crystallography of BrenkiteHide

Crystal System:

Orthorhombic

Class (H-M):

mmm (2/m 2/m 2/m) - Dipyramidal

Space Group:

Pbcn

Setting:

Pbcn

Cell Parameters:

a = 7.650(4) Å, b = 7.550(2) Å, c = 6.548(2) Å

Ratio:

a:b:c = 1.013 : 1 : 0.867

Unit Cell V:

378.20 Å³ (Calculated from Unit Cell)

Morphology:

Lath-like crystals showing forms {010}, {110}, {102}, and {021}.

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)
0015679	Brenkite	Leufer U, Tillmanns E (1980) Die kristallstruktur von brenkit, Ca2F2CO3 Tschermaks Mineralogische und Petrographische Mitteilungen 27 261-266		1980		0	293

CIF Raw Data - click here to close

data_global
_chemical_name_mineral 'Brenkite'
loop_
_publ_author_name
'Leufer U'
'Tillmanns E'
_journal_name_full 'Tschermaks Mineralogische und Petrographische Mitteilungen'
_journal_volume 27 
_journal_year 1980
_journal_page_first 261
_journal_page_last 266
_publ_section_title
;
 Die kristallstruktur von brenkit, Ca2F2CO3
;
_database_code_amcsd 0015679
_chemical_formula_sum 'Ca2 C O3 F2'
_cell_length_a 7.650
_cell_length_b 7.550
_cell_length_c 6.548
_cell_angle_alpha 90
_cell_angle_beta 90
_cell_angle_gamma 90
_cell_volume 378.196
_exptl_crystal_density_diffrn      3.129
_symmetry_space_group_name_H-M 'P b c n'
loop_
_space_group_symop_operation_xyz
  'x,y,z'
  'x,-y,1/2+z'
  '-x,y,1/2-z'
  '1/2-x,1/2+y,z'
  '1/2+x,1/2-y,-z'
  '1/2+x,1/2+y,1/2-z'
  '1/2-x,1/2-y,1/2+z'
  '-x,-y,-z'
loop_
_atom_site_label
_atom_site_fract_x
_atom_site_fract_y
_atom_site_fract_z
Ca   0.32447   0.16198   0.46489
C   0.00000   0.02830   0.25000
O1   0.00000   0.20020   0.25000
O2   0.36750   0.44510   0.32050
F   0.37980   0.12050   0.10100
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
Ca 0.00874 0.00671 0.01077 -0.00013 -0.00051 -0.00013
C 0.01152 0.00811 0.00849 0.00000 -0.00114 0.00000
O1 0.02482 0.00722 0.01646 0.00000 0.00722 0.00000
O2 0.01254 0.01241 0.02330 0.00203 0.00836 0.00519
F 0.01102 0.01431 0.01330 -0.00089 -0.00101 -0.00253

X-Ray Powder DiffractionHide

Powder Diffraction Data:

d-spacing	Intensity
2.794 Å	(100)
3.028 Å	(80)
3.006 Å	(80)
1.835 Å	(80)
2.486 Å	(70)
3.276 Å	(60)
2.265 Å	(60)

Geological EnvironmentHide

Paragenetic Mode(s):

Paragenetic Mode	Earliest Age (Ga)
Near-surface Processes
23 : Subaerial aqueous alteration by non-redox-sensitive fluids (see also #47)
Stage 4b: Highly evolved igneous rocks	>3.0
35 : Ultra-alkali and agpaitic igneous rocks
36 : Carbonatites, kimberlites, and related igneous rocks

Type Occurrence of BrenkiteHide

Type Locality:

ⓘ Schellkopf, Brenk, Brohltal, Ahrweiler, Rhineland-Palatinate, Germany

General Appearance of Type Material:

Prismatic crystals

Place of Conservation of Type Material:

Johannes Gutenberg University, Mainz, Germany; National Museum of Natural History, Washington, D.C., USA, 137256.

Geological Setting of Type Material:

In voids and fissures in a porphryritic selbergite

Associated Minerals at Type Locality:

Reference:

Hentschel, G., Leufer, U., Tillmanns, E. (1978): Brenkit, ein neues Kalzium-Fluor-Carbonat von Schellkopf/Eifel. N.Jb.Mineral., Mh, 1978, 325-329.

Synonyms of BrenkiteHide

IMA1977-036

Other Language Names for BrenkiteHide

German:Brenkit

Russian:Бренкит

Spanish:Brenkita

Common AssociatesHide

Associated Minerals Based on Photo Data:

6 photos of Brenkite associated with Phillipsite Subgroup
4 photos of Brenkite associated with Zeophyllite	Ca₁₃Si₁₀O₂₈(OH)₂F₈ · 6H₂O
3 photos of Brenkite associated with Polylithionite	KLi₂Al(Si₄O₁₀)(F,OH)₂
3 photos of Brenkite associated with Aegirine	NaFe³⁺Si₂O₆

Related Minerals - Strunz-mindat Grouping Hide

5.BC.10	Rouvilleite	Na₃CaMn²⁺(CO₃)₃F	Mon. 2/m : B2/b
5.BC.15	Podlesnoite	BaCa₂(CO₃)₂F₂	Orth. mmm (2/m 2/m 2/m) : Cmcm

Other InformationHide

Notes:

Dissolves with effervescence in dilute 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 BrenkiteHide

mindat.org URL:

https://www.mindat.org/min-764.html
Please feel free to link to this page.

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External Links:

Look for Brenkite on Webmineral

Look for Brenkite on Wikipedia

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Raman and XRD data at RRUFF project

References and PDF downloads at RRUFF project

American Mineralogist Crystal Structure Database

Handbook of Mineralogy page PDF

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References for BrenkiteHide

Reference List:

Hentschel, G., Leufer, U., Tillmanns, E. (1978): Brenkit, ein neues Kalzium-Fluor-Carbonat von Schellkopf, Eifel. Neues Jahrbuch für Mineralogie, Monatshefte, 1978, 325-329.

Hentschel, G., Leufer, U., Tillmanns, E. (1978): Brenkit, ein neues Kalzium-Fluor-Carbonat von Schellkopf/Eifel. N.Jb.Mineral., Mh, 1978, 325-329.

Fleischer, Michael, Chao, George Y., Pabst, and Adolf (1979) New Mineral Names. American Mineralogist, 64 (1-2) 241-245

Leufer, U., Tillmanns, E. (1980) Die kristallstruktur von brenkit Ca2F2CO3. Tschermaks Mineralogische und Petrographische Mitteilungen, 27, 261-266.

(2023) Brenkite. Handbook of Mineralogy. Mineralogical Society of America

Localities for BrenkiteHide

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.


Germany (TL)
Rhineland-Palatinate Ahrweiler Brohltal Brenk ⓘ Schellkopf (TL)	Neues Jahrb.Min. (1978) +1 other reference

Poland
Podlaskie Voivodeship ⓘ Tajno alkaline-carbonatite massif	Volume 26 +1 other reference

Sweden
Jämtland County ⓘ Sörvik granite intrusion	Lindh (2012)

USA
New Mexico Colfax County Springer Point of Rocks Mesa (Pecks Mesa) ⓘ Point of Rocks Quarry	Rocks & Min.: 60:229.

Brenkite

About BrenkiteHide

Unique IdentifiersHide

IMA Classification of BrenkiteHide

Classification of BrenkiteHide

Mineral SymbolsHide

Physical Properties of BrenkiteHide

Optical Data of BrenkiteHide

Chemistry of BrenkiteHide

Crystallography of BrenkiteHide

Crystal StructureHide

X-Ray Powder DiffractionHide

Geological EnvironmentHide

Type Occurrence of BrenkiteHide

Synonyms of BrenkiteHide

Other Language Names for BrenkiteHide

Common AssociatesHide

Related Minerals - Strunz-mindat GroupingHide

Other InformationHide

Internet Links for BrenkiteHide

References for BrenkiteHide

Localities for BrenkiteHide

Locality ListHide

Related Minerals - Strunz-mindat Grouping Hide