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Reinhardbraunsite

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Formula:
Ca
 
5
(SiO
 
4
)
 
2
(OH,F)
 
2
System:MonoclinicColour:Pale pink
Hardness:5 - 6
Member of:Chegemite series Group > Humite Group
Name:Named after Reinhard Brauns, Professor of Mineralogy.
Isostructural with:Alleghanyite, Chegemite, Chondrodite, Edgrewite, Hydroxylchondrodite, Hydroxylclinohumite, Jerrygibbsite, Kumtyubeite, Leucophoenicite, Manganhumite, Norbergite, Ribbeite, Sonolite


Humite Group.

The OH analogue of Kumtyubeite.

Classification of Reinhardbraunsite

IMA status:Approved 1980
Strunz 8th edition ID:8/B.04-70
Nickel-Strunz 10th (pending) edition ID:9.AF.45

9 : SILICATES (Germanates)
A : Nesosilicates
F : Nesosilicates with additional anions; cations in [4], [5] and/or only [6] coordination
Dana 8th edition ID: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
Hey's CIM Ref.:14.2.7

14 : Silicates not Containing Aluminum
2 : Silicates of Cu
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Type Occurrence of Reinhardbraunsite

Type Locality:Caspar quarry, Bellerberg volcano, Ettringen, Mayen, Eifel, Rhineland-Palatinate, Germany
Year of Discovery:1980

Physical Properties of Reinhardbraunsite

Lustre:Vitreous
Diaphaneity (Transparency):Translucent
Colour:Pale pink
Hardness (Mohs):5 - 6

Crystallography of Reinhardbraunsite

Crystal System:Monoclinic
Class (H-M):2/m - Prismatic
Space Group:P21/b
Cell Parameters:a = 11.45Å, b = 5.05Å, c = 8.84Å
β = 108.91°
Ratio:a:b:c = 2.267 : 1 : 1.75
Unit Cell Volume:V 483.56 ų (Calculated from Unit Cell)

Optical Data of Reinhardbraunsite

Type:Biaxial (-)
RI values: nα = 1.606 nβ = 1.617 nγ = 1.620
2V:Measured: 44° to 50°, Calculated: 54°
Maximum Birefringence:δ = 0.014

Chart shows birefringence interference colour range (at 30µm thickness) and does not take into account mineral colouration.
Surface Relief:Moderate
Dispersion:r < v

Chemical Properties of Reinhardbraunsite

Formula:
Ca
 
5
(SiO
 
4
)
 
2
(OH,F)
 
2
Simplified for copy/paste:Ca5(SiO4)2(OH,F)2
Essential elements:Ca, H, O, Si
All elements listed in formula:Ca, F, H, O, Si
Common Impurities:H2O,P

Relationship of Reinhardbraunsite to other Species

Member of:Chegemite series Group > Humite Group
Other Members of Group:

- +
Chegemite
Ca
 
7
(SiO
 
4
)
 
3
(OH)
 
2
Edgrewite
Ca
 
9
(SiO
 
4
)
 
4
F
 
2
Kumtyubeite
Ca
 
5
(SiO
 
4
)
 
2
F
 
2
Related Minerals - Nickel-Strunz Grouping):

- +
9.AF.05Sillimanite
Al
 
2
(SiO
 
4
)O
9.AF.10Andalusite
Al
 
2
(SiO
 
4
)O
9.AF.10Kanonaite
Mn
3+
 
Al(SiO
 
4
)O
9.AF.15Kyanite
Al
 
2
(SiO
 
4
)O
9.AF.20Mullite
Al
 
4+2x
Si
 
2-2x
O
 
10-x
9.AF.20Krieselite
(Al,Ga)
 
2
(GeO
 
4
)(OH)
 
2
9.AF.23Boromullite
Al
 
9
BSi
 
2
O
 
19
9.AF.25Yoderite
Mg(Al,Fe
3+
 
)
 
3
(SiO
 
4
)
 
2
O(OH)
9.AF.30Magnesiostaurolite
(Mg,Li,Fe
2+
 
)
 
1.5-2
Al
 
9
(SiO
 
4
)
 
4
O
 
6
(OH)
 
2
9.AF.30Staurolite
(Fe
2+
 
,Mg,Zn)
 
1.5-2
Al
 
9
(SiO
 
4
)
 
4
O
 
6
(OH,O)
 
2
9.AF.30Zincostaurolite
(Zn,Li,Fe
2+
 
,Mg)
 
1.5-2
Al
 
9
(SiO
 
4
)
 
4
O
 
6
(OH)
 
2
9.AF.35Topaz
Al
 
2
(SiO
 
4
)(F,OH)
 
2
9.AF.40Norbergite
Mg
 
3
(SiO
 
4
)(F,OH)
 
2
9.AF.45Alleghanyite
Mn
2+
5
(SiO
 
4
)
 
2
(OH)
 
2
9.AF.45Chondrodite
(Mg,Fe
2+
 
)
 
5
(SiO
 
4
)
 
2
(F,OH)
 
2
9.AF.45Kumtyubeite
Ca
 
5
(SiO
 
4
)
 
2
F
 
2
9.AF.45Hydroxylchondrodite
Mg
 
5
(SiO
 
4
)
 
2
(OH)
 
2
9.AF.50Humite
(Mg,Fe
2+
 
)
 
7
(SiO
 
4
)
 
3
(F,OH)
 
2
9.AF.50Manganhumite
(Mn
2+
 
,Mg)
 
7
(SiO
 
4
)
 
3
(OH)
 
2
9.AF.50Unnamed (Ca-analogue of Humite)
Ca
 
7
(SiO
 
4
)
 
4
F
 
2
9.AF.55Clinohumite
Mg
 
9
(SiO
 
4
)
 
4
F
 
2
9.AF.55Sonolite
Mn
2+
9
(SiO
 
4
)
 
4
(OH,F)
 
2
9.AF.55Hydroxylclinohumite
Mg
 
9
(SiO
 
4
)
 
4
(OH)
 
2
9.AF.60Leucophoenicite
Mn
2+
7
(SiO
 
4
)
 
3
(OH)
 
2
9.AF.65Ribbeite
(Mn
2+
 
,Mg)
 
5
(SiO
 
4
)
 
2
(OH)
 
2
9.AF.70Jerrygibbsite
Mn
2+
9
(SiO
 
4
)
 
4
(OH)
 
2
9.AF.75Franciscanite
Mn
2+
6
(V
5+
 
,☐)
 
2
(SiO
 
4
)
 
2
(O,OH)
 
6
9.AF.75Örebroite
Mn
2+
3
(Sb
5+
 
,Fe
3+
 
)(SiO
 
4
)(O,OH)
 
3
9.AF.75Welinite
Mn
2+
6
(W
6+
 
,Mg)
 
2
(SiO
 
4
)
 
2
(O,OH)
 
6
9.AF.80Ellenbergerite
Mg
 
6
(Mg,Ti,Zr,◻)
 
2
(Al,Mg)
 
6
Si
 
8
O
 
28
(OH)
 
10
9.AF.85Chloritoid
(Fe
2+
 
,Mg,Mn
2+
 
)Al
 
2
(SiO
 
4
)O(OH)
 
2
9.AF.85Magnesiochloritoid
MgAl
 
2
(SiO
 
4
)O(OH)
 
2
9.AF.85Ottrélite
(Mn
2+
 
,Fe
2+
 
,Mg)Al
 
2
(SiO
 
4
)O(OH)
 
2
9.AF.90Poldervaartite
CaCa[SiO
 
3
(OH)](OH)
9.AF.90Olmiite
CaMn
2+
 
[SiO
 
3
(OH)](OH)
Related Minerals - Hey's Index Grouping:

- +
14.2.1Dioptase
CuSiO
 
3
· H
 
2
O
14.2.2Shattuckite
Cu
 
5
(Si
 
2
O
 
6
)
 
2
(OH)
 
2
14.2.3Plancheite
Cu
 
8
(Si
 
8
O
 
22
)(OH)
 
4
· H
 
2
O
14.2.4Gilalite
Cu
 
5
Si
 
6
O
 
17
· 7H
 
2
O
14.2.5Chrysocolla
Cu
 
2-x
Al
 
x
(H
 
2-x
Si
 
2
O
 
5
)(OH)
 
4
· nH
 
2
O (x < 1)
14.2.6Litidionite
CuNaKSi
 
4
O
 
10
14.2.8Cuprorivaite
CaCu[Si
 
4
O
 
10
]
14.2.9Kinoite
Ca
 
2
Cu
 
2
(H
 
2
O)
 
2
[Si
 
3
O
 
10
]
14.2.10Stringhamite
CaCu(SiO
 
4
) · H
 
2
O
14.2.11Apachite
Cu
 
9
Si
 
10
O
 
29
· 11H
 
2
O

Other Names for Reinhardbraunsite

Synonyms:
Calcio-chondroditeCalcium ChondroditeIMA1980-032
Other Languages:
German:Reinhardbraunsit
Russian:Райнхардбраунсит
Spanish:Reinhardbraunsita

Other Information

Health Warning:No information on health risks for this material has been entered into the database. You should always treat mineral specimens with care.

References for Reinhardbraunsite

Reference List:

- +
Hamm, H. M., Hentschel, G., (1983): Reinhardbraunsit, Ca5(SiO4)2(OH,F)2, a new mineral - the natural equivalent of synthetic „calcio-chondrodite“: Neues Jahrb. Mineral. Mh. (1983): 119-129.

American Mineralogist (1983): 68: 1039-1040.

Tschermaks Mineralogische und Petrographische Mitteilungen: 31: 137-150.

American Mineralogist, Volume 94, pages 1361–1370, 2009

Best Localities for Reinhardbraunsite

Best of Species:Reinhardbraunsite

Internet Links for Reinhardbraunsite

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  • Raman and XRD data at RRUFF project
  • American Mineralogist Crystal Structure Database
  • Reinhardbraunsite details from Handbook of Mineralogy (PDF)
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  • Localities for Reinhardbraunsite

    The 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.
    (TL) indicates type locality. ? indicates mineral may be doubtful at this locality. All other localities listed without reference should be considered as uncertain and unproven until references can be found.
    Germany
     
    • Rhineland-Palatinate
      • Eifel
        • Daun
          • Üdersdorf
    Schüller, W., Betz, V., Die Mineralien vom Emmelberg, Lapis 12/1986
        • Mayen
          • Ettringen
            • Bellerberg volcano
    Hamm, H. M., Hentschel, G., Reinhardbraunsit, Ca5(SiO4)2(OH,F)2, a new mineral - the natural equivalent of synthetic „calcio-chondrodite“ –, N. Jb. Mineral. Mh., 119-129, 1983
    Israel
     
    • Negev
    Vapnik, Y., Sokol, E., Murashko M., Sharygin V. (2006): The enigma of Hatrurim. Mineralogical Almanac, 10, 69-77.
    Romania
     
    • Brașov Co.
      • Racoş Commune
    Szakáll, S., Kristály, F., 2010. Mineralogy of Székelyland, Eastern Transylvania, Romania. Sfântu Gheorghe-Miercurea Ciuc-Târgu Mureş. 2010.
    • Harghita Co.
      • Odorheiu Secuiesc (Székelyudvarhely; Oderhellen)
        • Racoş (Racoşu de Jos)
    Szakáll, S. & Kristály, F., Eds. (2010): Mineralogy of Székelyland, Eastern Transylvania, Romania. Csík County Nature and Conservation Society, Miercurea-Ciuc, Romania, 321 pp.
    Russia
     
    • Northern Caucasus Region
      • Kabardino-Balkarian Republic
        • Verkhnechegemskaya caldera (Verkhni Chegem caldera; Upper Chegem caldera)
    A. E. Zadov data; American Mineralogist, Volume 94, pages 1361–1370, 2009
    Uganda
     
    • Kabarole District
    Barker, D.S. and Nixon, P.H. (1989) High-Ca, low-alkali carbonatite volcanism at Fort Portal, Uganda. Contributions to Minralogy and Petrology.: 103: 166-177.
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