Reinhardbraunsite Mineral Data

General Reinhardbraunsite Information

Chemical Formula:

Ca5(SiO4)2(OH,F)2

Composition:

Molecular Weight = 419.57 gm

Calcium 47.76 % Ca 66.83 % CaO

Silicon 13.39 % Si 28.64 % SiO₂

Hydrogen 0.36 % H 3.22 % H₂O

Oxygen 36.23 % O

Fluorine 2.26 % F 2.26 % F

- % F -0.95 % -O=F₂

______ ______

100.00 % 100.00 % = TOTAL OXIDE

Empirical Formula:

Ca₅(SiO₄)₂(OH)_1.5F_0.5

Environment:

In contact metamorphosed and metasomatized calcium-rich xenoliths in scoria.

IMA Status:

Approved IMA 1983

Locality:

Ettringer Bellerberg volcano, near Mayen, Eifel district, Germany. Link to MinDat.org Location Data.

Name Origin:

Named for Reinhard Brauns (1861-1937), Professor of Mineralogy at the University of Bonn, Bonn, Germany.

Name Pronunciation:

Reinhardbraunsite + Pronunciation

Synonym:

Calciochondrodite

ICSD 31275

PDF 37-414

Reinhardbraunsite Image

Images:

Reinhardbraunsite Brownmillerite

Comments: Pink crystalline reinhardbraunsite in brownmillerite.
Location: Near Bellerberg, Eifel, Rheinland-Pflaz, Germany. Scale: See Photo.
© Jeff Weissman / Photographic Guide to Mineral Species

Reinhardbraunsite Crystallography

Axial Ratios:

a:b:c =2.268:1:1.7498

Cell Dimensions:

a = 11.458, b = 5.052, c = 8.84, Z = 2; beta = 108.91° V = 484.09 Den(Calc)= 2.88

Crystal System:

Monoclinic - Prismatic H-M Symbol (2/m) Space Group: P 2₁/a

$Help on X Ray Diffraction:$ X Ray Diffraction:

By Intensity(I/I_o): 1.902(1), 3.335(0.8), 2.903(0.75),

Physical Properties of Reinhardbraunsite

Cleavage:

{110} Distinct

Color:

Light pink.

Density:

2.84

Hardness:

5-6 - Between Apatite and Orthoclase

Luster:

Vitreous (Glassy)

Streak:

white

Optical Properties of Reinhardbraunsite

Gladstone-Dale:

CI meas= -0.021 (Excellent) - where the CI = (1-KPDmeas/KC)
CI calc= -0.007 (Superior) - where the CI = (1-KPDcalc/KC)
KPDcalc= 0.2133,KPDmeas= 0.2163,KC= 0.2119
Ncalc = 1.6 - 1.61

Optical Data:

Biaxial (-), a=1.606, b=1.617, g=1.62, bire=0.0140, 2V(Calc)=54, 2V(Meas)=44-50.

Calculated Properties of Reinhardbraunsite

Electron Density:

Bulk Density (Electron Density)=2.88 gm/cc
note: Specific Gravity of Reinhardbraunsite =2.88 gm/cc.

Fermion Index:

Fermion Index = 0.0070713388
Boson Index = 0.9929286612

Photoelectric:

PE_{Reinhardbraunsite}= 6.37 barns/electron
U=PE_{Reinhardbraunsite} x rElectron Density= 18.36 barns/cc.

Radioactivity:

GRapi = 0 (Gamma Ray American Petroleum Institute Units)
Reinhardbraunsite is Not Radioactive

Reinhardbraunsite Classification

Dana Class:

52.03.02b.03 (52)Nesosilicate Insular SiO4 Groups and O, OH, F, and H2O

(52.03)with cations in [6] coordination only

(52.03.02b)Humite group (Chondrodite series)

52.03.02b.01 Alleghanyite Mn5(SiO4)2(OH)2 P 2₁/a 2/m

52.03.02b.02 Chondrodite (Mg,Fe)5(SiO4)2(F,OH)2 P 2₁/c 2/m

52.03.02b.03 Reinhardbraunsite Ca5(SiO4)2(OH,F)2 P 2₁/a 2/m

52.03.02b.04 Ribbeite (Mn,Mg)5(SiO4)2(OH)2 P nma 2/m 2/m 2/m

52.03.02b.05 Kumtyubeite! Ca5(SiO4)2F2 P 2₁/a 2/m

Strunz Class:

09.AF.45 09 - SILICATES (Germanates)

09.A - Nesosilicates

09.AF -Nesosilicates with additional anions;

09.AF.45 Alleghanyite Mn5(SiO4)2(OH)2 P 2₁/a 2/m

09.AF.45 Chondrodite (Mg,Fe)5(SiO4)2(F,OH)2 P 2₁/c 2/m

09.AF.45 Reinhardbraunsite Ca5(SiO4)2(OH,F)2 P 2₁/a 2/m

09.AF.45 Kumtyubeite! Ca5(SiO4)2F2 P 2₁/a 2/m

Other Reinhardbraunsite Information

References:

NAME( AntBidBlaNic2) PHYS. PROP.(Enc. of Minerals,2nd ed.,1990) OPTIC PROP.(Enc. of Minerals,2nd ed.,1990)

See Also:

Links to other databases for Reinhardbraunsite :
1 - Am. Min. Crystal Structure Database
2 - Athena
3 - EUROmin Project
4 - Ecole des Mines de Paris
5 - GeoScienceWorld
6 - Google Images
7 - Google Scholar
8 - Handbook of Mineralogy (MinSocAm)
9 - Handbook of Mineralogy (UofA)
10 - MinDAT
11 - Mineralienatlas (Deutsch)
12 - Online Mineral Museum
13 - QUT Mineral Atlas
14 - Ruff.Info
15 - WWW-MINCRYST

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Reinhardbraunsite

Ca5(SiO4)2(OH,F)2
Dana No: 52.03.02b.03 Strunz No: 09.AF.45
Locality:

Notes:

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