Reinhardbraunsite
A valid IMA mineral species
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About Reinhardbraunsite
Reinhard Brauns
Formula:
Ca5(SiO4)2(OH,F)2
Colour:
Pale pink
Lustre:
Vitreous
Hardness:
5 - 6
Specific Gravity:
2.85
Crystal System:
Monoclinic
Member of:
Name:
Named in honor of Dr. Reinhard Brauns (20 August 20, 1867, Eiterfeld, near Cassel, Germany - 28 January 1937), Professor of Mineralogy and Petrography at the University of Bonn. He had over 200 publications on different aspects of mineralogy and petrography including studies on the optical anomalies of crystals, a treatise on chemical mineralogy, the properties of gem minerals, and many articles dealing with the rocks and minerals of the volcanic areas of the Rheinland and the famous Laacher See district.
Isostructural with:
Reinhardbraunsite is a mineral in the humite Group. It is the (OH)-dominant member in a series with Kumtyubeite. The Reinhardbraunite-Kumtyubeite series form the Ca-dominant equivalent of the chondrodite-hydroxylchondrodite series. A mineral with a reinhardbraunsite composition was synthesized in 1958 and named calciochondrodite, but the naturally occurring mineral was given the name reinhardbraunsite upon its discovery in 1983.
Reinhardbraunsite is, like all Ca-humites, a product of high-temperature and low-pressure environments, and it is a product of contact metamorphism between high-temperature magma/lava flows and carbonate rocks.
Reinhardbraunsite is, like all Ca-humites, a product of high-temperature and low-pressure environments, and it is a product of contact metamorphism between high-temperature magma/lava flows and carbonate rocks.
Unique Identifiers
Mindat ID:
3387
Long-form identifier:
mindat:1:1:3387:5
GUID
(UUID V4):
(UUID V4):
429085d5-c8d7-47e0-80ec-1e313c800331
IMA Classification of Reinhardbraunsite
Approved
IMA Formula:
Ca5(SiO4)2(OH)2
Approval year:
1980
First published:
1983
Classification of Reinhardbraunsite
9.AF.45
9 : SILICATES (Germanates)
A : Nesosilicates
F : Nesosilicates with additional anions; cations in [4], [5] and/or only [6] coordination
9 : SILICATES (Germanates)
A : Nesosilicates
F : Nesosilicates with additional anions; cations in [4], [5] and/or only [6] coordination
52.3.2b.3
52 : NESOSILICATES Insular SiO4 Groups and O,OH,F,H2O
3 : Insular SiO4 Groups and O, OH, F, and H2O with cations in [6] coordination only
52 : NESOSILICATES Insular SiO4 Groups and O,OH,F,H2O
3 : Insular SiO4 Groups and O, OH, F, and H2O with cations in [6] coordination only
14.2.7
14 : Silicates not Containing Aluminum
2 : Silicates of Cu
14 : Silicates not Containing Aluminum
2 : Silicates of Cu
Mineral Symbols
As of 2021 there are now IMA–CNMNC approved mineral symbols (abbreviations) for each mineral species, useful for tables and diagrams.
| Symbol | Source | Reference |
|---|---|---|
| Rbn | 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 Reinhardbraunsite
Vitreous
Transparency:
Translucent
Colour:
Pale pink
Streak:
White
Hardness:
5 - 6 on Mohs scale
Cleavage:
Distinct/Good
On {001}
On {001}
Fracture:
Conchoidal
Density:
2.85(2) g/cm3 (Measured) 2.885 g/cm3 (Calculated)
Optical Data of Reinhardbraunsite
Type:
Biaxial (-)
RI values:
nα = 1.606(2) nβ = 1.617(2) nγ = 1.620(2)
2V:
Measured: 44° to 50°, Calculated: 54°
Max Birefringence:
δ = 0.014
Image shows birefringence interference colour range (at 30µm thickness)
and does not take into account mineral colouration.
and does not take into account mineral colouration.
Surface Relief:
Moderate
Dispersion:
r > v, distinct
Optical Extinction:
Z = b; X ∧ c = 18(1)°.
Chemistry of Reinhardbraunsite
Mindat Formula:
Ca5(SiO4)2(OH,F)2
Common Impurities:
H2O,P
Crystallography of Reinhardbraunsite
Crystal System:
Monoclinic
Class (H-M):
2/m - Prismatic
Space Group:
P21/b
Cell Parameters:
a = 11.45 Å, b = 5.05 Å, c = 8.84 Å
β = 108.91°
β = 108.91°
Ratio:
a:b:c = 2.267 : 1 : 1.75
Unit Cell V:
483.56 ų (Calculated from Unit Cell)
Z:
2
Twinning:
Single and multiple twinning on {001}, noted only in minute recrystallized grains.
Crystal Structure
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2x2x2 | 3x3x3 | 4x4x4
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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) |
|---|---|---|---|---|---|---|---|
| 0015581 | Reinhardbraunsite | Kuznetsova T P, Nevskii N N, Ilyukhin V V, Belov N V (1980) Refinement of the crystal structure of calcium chondrodite Ca5[SiO4]2(OH)2=Ca(OH)2*2Ca2SiO4 Soviet Physics Crystallography 25 91-92 | 1980 | synthetic | 0 | 293 | |
| 0015696 | Reinhardbraunsite | Kirfel A, Hamm H M, Will G (1983) The crystal structure of reinhardbraunsite, Ca5(SiO4)2(OH,F)2, a new mineral of the calcio-chondrodite type Tschermaks Mineralogische und Petrographische Mitteilungen 31 137-150 | 1983 | synthetic | 0 | 293 |
CIF Raw Data - click here to close
X-Ray Powder Diffraction
Powder Diffraction Data:
| d-spacing | Intensity |
|---|---|
| 1.902 Å | (100) |
| 3.035 Å | (80) |
| 2.903 Å | (75) |
| 3.322 Å | (50) |
| 2.941 Å | (50) |
| 1.894 Å | (50) |
| 1.658 Å | (45) |
Comments:
Bellerberg volcano, Germany. Data from the type description.
Geological Environment
Paragenetic Mode(s):
| Paragenetic Mode | Earliest Age (Ga) |
|---|---|
| Stage 3a: Earth’s earliest Hadean crust | >4.50 |
| 9 : Lava/xenolith minerals (hornfels, sanidinite facies) | |
| Stage 10a: Neoproterozoic oxygenation/terrestrial biosphere | <0.6 |
| 51 : Pyrometamorphic minerals (see also #54 and #56) | <0.36 |
Type Occurrence of Reinhardbraunsite
General Appearance of Type Material:
Anhedral to subhedral grains, up to 3 mm.
Place of Conservation of Type Material:
Mineralogical-Petrological Institute, University of Bonn, Bonn, Germany.
Geological Setting of Type Material:
Occurs in xenoliths in scoria.
Associated Minerals at Type Locality:
Reference:
Hamm, H.M., Hentschel, G. (1983) Reinhardbraunsite, Ca5(SiO4)2(OH,F)2, a new mineral - the natural equivalent of synthetic "calcio-chondrodite". Neues Jahrbuch für Mineralogie, Monatshefte, 1983, 119-129.
Synonyms of Reinhardbraunsite
Other Language Names for Reinhardbraunsite
Relationship of Reinhardbraunsite to other Species
Member of:
Other Members of this group:
| Chegemite | Ca7(SiO4)3(OH)2 | Orth. mmm (2/m 2/m 2/m) |
| Edgrewite | Ca9(SiO4)4F2 | Mon. 2/m : P21/b |
| Fluorchegemite | Ca7(SiO4)3F2 | Orth. mmm (2/m 2/m 2/m) |
| Hydroxyledgrewite | Ca9(SiO4)4(OH)2 | Mon. 2/m : P21/b |
| Kumtyubeite | Ca5(SiO4)2F2 | Mon. 2/m : P21/b |
Common Associates
Associated Minerals Based on Photo Data:
| 1 photo of Reinhardbraunsite associated with Brownmillerite | Ca2(Al,Fe3+)2O5 |
Related Minerals - Strunz-mindat Grouping
| 9.AF. | Chegemite | Ca7(SiO4)3(OH)2 |
| 9.AF. | Barwoodite | Mn2+6Nb5+(SiO4)2O3(OH)3 |
| 9.AF. | Jingwenite-(Y) | YAlV4+(SiO4)O2(OH)2 |
| 9.AF.05 | Sillimanite | Al2(SiO4)O |
| 9.AF.05 | Xenolite | Al10Si8O31 |
| 9.AF.10 | Andalusite | Al2(SiO4)O |
| 9.AF.10 | Kanonaite | Mn3+Al(SiO4)O |
| 9.AF.15 | Kyanite | Al2(SiO4)O |
| 9.AF.20 | Mullite | Al4+2xSi2-2xO10-x |
| 9.AF.20 | Krieselite | Al2(GeO4)F2 |
| 9.AF.23 | Boromullite | Al9BSi2O19 |
| 9.AF.25 | Yoderite | Mg(Al,Fe3+)3(SiO4)2O(OH) |
| 9.AF.30 | Magnesiostaurolite | Mg(Mg,Li)3(Al,Mg)18Si8O44(OH)4 |
| 9.AF.30 | Staurolite | Fe2+2Al9Si4O23(OH) |
| 9.AF.30 | Zincostaurolite | Zn2Al9Si4O23(OH) |
| 9.AF.35 | Topaz | Al2(SiO4)(F,OH)2 |
| 9.AF.40 | Norbergite | Mg3(SiO4)F2 |
| 9.AF.45 | Alleghanyite | Mn2+5(SiO4)2(OH)2 |
| 9.AF.45 | Chondrodite | Mg5(SiO4)2F2 |
| 9.AF.45 | Kumtyubeite | Ca5(SiO4)2F2 |
| 9.AF.45 | Hydroxylchondrodite | Mg5(SiO4)2(OH)2 |
| 9.AF.50 | Humite | Mg7(SiO4)3F2 |
| 9.AF.50 | Manganhumite | (Mn2+,Mg)7(SiO4)3(OH)2 |
| 9.AF.50 | Unnamed (Ca-analogue of Humite) | Ca7(SiO4)4F2 |
| 9.AF.50 | Fluorchegemite | Ca7(SiO4)3F2 |
| 9.AF.50 | Unnamed (OH-analogue of humite) | Mg7(SiO4)3(OH)2 |
| 9.AF.55 | Clinohumite | Mg9(SiO4)4F2 |
| 9.AF.55 | Sonolite | Mn2+9(SiO4)4(OH)2 |
| 9.AF.55 | Hydroxylclinohumite | Mg9(SiO4)4(OH)2 |
| 9.AF.60 | Leucophoenicite | Mn2+7(SiO4)3(OH)2 |
| 9.AF.65 | Ribbeite | Mn2+5(SiO4)2(OH)2 |
| 9.AF.70 | Jerrygibbsite | Mn2+9(SiO4)4(OH)2 |
| 9.AF.75 | Franciscanite | Mn2+6(V5+,◻)2(SiO4)2(O,OH)6 |
| 9.AF.75 | Örebroite | Mn2+3(Sb5+,Fe3+)(SiO4)(O,OH)3 |
| 9.AF.75 | Welinite | Mn2+6(W6+,Mg)2(SiO4)2(O,OH)6 |
| 9.AF.75 | Scorticoite | Mn6(Sb,◻)Σ2(SiO4)2O3(OH)3 |
| 9.AF.80 | Ellenbergerite | Mg6(Mg,Ti,Zr,◻)2(Al,Mg)6Si8O28(OH)10 |
| 9.AF.85 | Chloritoid | (Fe2+,Mg,Mn2+)Al2(SiO4)O(OH)2 |
| 9.AF.85 | Magnesiochloritoid | MgAl2(SiO4)O(OH)2 |
| 9.AF.85 | Ottrélite | (Mn2+,Fe2+,Mg)Al2(SiO4)O(OH)2 |
| 9.AF.90 | Poldervaartite | CaCa[SiO3(OH)](OH) |
| 9.AF.90 | Olmiite | CaMn2+[SiO3(OH)](OH) |
| 9.AF.95 | Pilawite-(Y) | Ca2Y2Al4(SiO4)4O2(OH)2 |
Other Information
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 Reinhardbraunsite
mindat.org URL:
https://www.mindat.org/min-3387.html
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References for Reinhardbraunsite
Reference List:
Galuskina, I. O., Lazic, B., Armbruster, T., Galuskin, E. V., Gazeev, V. M., Zadov, A. E., Pertsev, N. N., Jezak, L., Wrzalik, R., Gurbanov, A. G. (2009) Kumtyubeite Ca5(SiO4)2F2 — A new calcium mineral of the humite group from Northern Caucasus, Kabardino-Balkaria, Russia. American Mineralogist, 94 (10) 1361-1370 doi:10.2138/am.2009.3256
Localities for Reinhardbraunsite
symbol to view information about a locality.
The Locality List
- 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).
All localities listed without proper references should be considered as questionable.
Czech Republic | |
| Hršelová et al. (2013) |
Germany | |
| Blaß et al. (2015) |
| Hamm et al. (1983) |
| Galuskin et al. (2016) | |
| Schüller et al. (1986) |
Middle East | |
| Vapnik et al. (2006) | |
Romania | |
| Szakáll |
| Szakáll et al. (2010) | |
Russia | |
| Bailau +2 other references |
| Galuskin et al. (2011) |
| Galuskin +9 other references | |
Uganda | |
| Barker et al. (1989) |
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Caspar quarry, Ettringen, Vordereifel, Mayen-Koblenz, Rhineland-Palatinate, Germany