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Rosenhahnite

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Russian River, Cloverdale, Mendocino Co., California, USA
© Leon Hupperichs

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Formula:
HCa
 
3
[Si
 
3
O
 
9
(OH)]
System:TriclinicColour:White, beige, ...
Hardness:4½ - 5
Name:Named after Leo Rosenhahn, amateur mineralogist
This page provides mineralogical data about Rosenhahnite.

Classification of Rosenhahnite

IMA status:Approved
Strunz 8th edition ID:8/C.28-10
Nickel-Strunz 10th (pending) edition ID:9.BJ.10

9 : SILICATES (Germanates)
B : Sorosilicates
J : Sorosilicates with Si3O10, Si4O11, etc. anions; cations in octahedral [6] and greater coordination
Dana 8th edition ID:57.1.4.1

57 : SOROSILICATES Si3O10 Groups and Larger Noncyclic Groups
1 : Insular Si3O10 and Larger Noncyclic Groups with [Si3O10] groups
Hey's CIM Ref.:14.5.9

14 : Silicates not Containing Aluminum
5 : Silicates of Ca
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Type Occurrence of Rosenhahnite

Type Locality:Russian River, Cloverdale, Mendocino Co., California, USA
Year of Discovery:1967

Physical Properties of Rosenhahnite

Lustre:Vitreous
Colour:White, beige, colourless, yellow-brown
Streak:White
Hardness (Mohs):4½ - 5

Crystallography of Rosenhahnite

Crystal System:Triclinic
Cell Parameters:a = 6.95Å, b = 9.48Å, c = 6.81Å
α = 108.64°, β = 94.84°, γ = 95.89°
Ratio:a:b:c = 0.733 : 1 : 0.718
Unit Cell Volume:V 419.62 ų (Calculated from Unit Cell)

Optical Data of Rosenhahnite

Type:Biaxial (-)
RI values: nα = 1.608 - 1.625 nβ = 1.640 - 1.650 nγ = 1.646 - 1.650
Maximum Birefringence:δ = 0.038

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 Rosenhahnite

Formula:
HCa
 
3
[Si
 
3
O
 
9
(OH)]
Essential elements:Ca, H, O, Si
All elements listed in formula:Ca, H, O, Si
Common Impurities:B,Al,Fe,Mn,Mg,Sr,Ba,Na,H2O

Relationship of Rosenhahnite to other Species

Related Minerals - Nickel-Strunz Grouping):

- +
9.BJ.05Orientite
Ca
 
2
MnMn
 
2
Si
 
3
O
 
10
(OH)
 
4
9.BJ.15Trabzonite
Ca
 
4
Si
 
3
O
 
10
·2H
 
2
O
9.BJ.20Thalénite-(Y)
Y
 
3
Si
 
3
O
 
10
(OH)
9.BJ.20Fluorthalénite-(Y)
Y
 
3
Si
 
3
O
 
10
F
9.BJ.25Tiragalloite
Mn
 
4
AsSi
 
3
O
 
12
(OH)
9.BJ.30Medaite
(Mn,Ca)
 
6
(V,As)Si
 
5
O
 
18
OH
9.BJ.35Ruizite
Ca
 
2
Mn
3+
2
[(OH)
 
2
|H
 
2
Si
 
4
O
 
13
] · 2H
 
2
O
9.BJ.40Ardennite-(As)
Mn
2+
4
[(Al,Mg)
 
6
][(OH)
 
6
|(AsO
 
4
,VO
 
4
)|(SiO
 
4
)
 
2
|Si
 
3
O
 
10
]
9.BJ.40Ardennite-(V)
Mn
2+
4
[Al
 
4
(Mg,Al,Fe
3+
 
,Mn
3+
 
)
 
2
][(OH)
 
6
|(VO
 
4
,SiO
 
4
)|(SiO
 
4
)
 
2
|Si
 
3
O
 
10
]
9.BJ.45Kilchoanite
Ca
 
3
Si
 
2
O
 
7
9.BJ.50Kornerupine
Mg
 
3
Al
 
6
(Si,Al,B)
 
5
O
 
21
(OH)
9.BJ.50Prismatine
([ ],Fe,Mg)(Mg,Al,Fe)
 
5
Al
 
4
Si
 
2
(Si,Al)
 
2
(B,Si,Al)(O,OH,F)
 
22
9.BJ.55Zunyite
Al
 
13
Si
 
5
O
 
20
(OH,F)
 
18
Cl
9.BJ.60Hubeite
Ca
 
2
Mn
2+
 
Fe
3+
 
[HSi
 
4
O
 
13
] · 2H
 
2
O
9.BJ.65Cassagnaite
(Ca,Mn
2+
 
)
 
4
(Fe
3+
 
,Mn
3+
 
,Al)
 
4
(V
3+
 
,Mg,Al)
 
2
[(O,OH)
 
4
|(OH)
 
4
|(SiO
 
4
)
 
2
|Si
 
3
O
 
10
]
Related Minerals - Hey's Index Grouping:

- +
14.5.1Wollastonite
Ca[SiO
 
3
]
14.5.2Wollastonite-7T
14.5.3Wollastonite-2M
CaSiO
 
3
14.5.4Rankinite
Ca
 
3
Si
 
2
O
 
7
14.5.5Kilchoanite
Ca
 
3
Si
 
2
O
 
7
14.5.6Larnite
Ca
 
2
[SiO
 
4
]
14.5.7Bredigite
Ca
 
7
Mg[SiO
 
4
]
 
4
14.5.8Hatrurite
Ca
 
3
[O|SiO
 
4
]
14.5.10Dellaite
Ca
 
6
(Si
 
2
O
 
7
)(SiO
 
4
)(OH)
 
2
14.5.11Afwillite
Ca
 
3
[HSiO
 
4
]
 
2
 · 2H
 
2
O
14.5.12Xonotlite
Ca
 
6
Si
 
6
O
 
17
(OH)
 
2
14.5.13Foshagite
Ca
 
4
[(OH)
 
2
|Si
 
3
O
 
9
]
14.5.14Hillebrandite
Ca
 
2
[(OH)
 
2
|SiO
 
3
]
14.5.15Jaffeite
Ca
 
6
[(OH)
 
6
|Si
 
2
O
 
7
]
14.5.16Suolunite
Ca
 
2
[H
 
2
Si
 
2
O
 
7
] · H
 
2
O
14.5.17Killalaite
Ca
 
3
[Si
 
2
O
 
7
] · 0.5H
 
2
O
14.5.18Okenite
CaSi
 
2
O
 
5
·2H
 
2
O
14.5.19Riversideite
Ca
 
5
Si
 
6
O
 
16
(OH)
 
2
·2H
 
2
O
14.5.20Trabzonite
Ca
 
4
Si
 
3
O
 
10
·2H
 
2
O
14.5.21Gyrolite
Ca
 
4
(Si
 
6
O
 
15
)(OH)
 
2
·3H
 
2
O
14.5.22Foshallasite
Ca
 
3
[Si
 
2
O
 
7
] · 3H
 
2
O(?)
14.5.23Tobermorite
Ca
 
5
Si
 
6
(O,OH)
 
18
·5H
 
2
O
14.5.24Clinotobermorite
Ca
 
5
[Si
 
3
O
 
8
(OH)
 
2
]2.4H
 
2
O - Ca
 
5
[Si
 
6
O
 
17
]·5H
 
2
O
14.5.25Nekoite
Ca
 
3
Si
 
6
O
 
15
·7H
 
2
O
14.5.26Plombièrite
Ca
 
5
Si
 
6
O
 
16
(OH)
 
2
·7H
 
2
O
14.5.27Jennite
Ca
 
9
H
 
2
Si
 
6
O
 
18
(OH)
 
8
·6H
 
2
O

Other Names for Rosenhahnite

Synonyms:
IMA1965-030
Other Languages:
German:Rosenhahnit
Russian:Розенханит
Spanish:Rosenhahnita

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 Rosenhahnite

Reference List:Pabst, Adolf, Gross, E.B., and Alfors, J.T. (1967) Rosenhahnite, a new hydrous calcium silicate from Mendocino County, California. American Mineralogist: 52: 336-351.

Jeffery, J. W. & Lindley, P. F. (1973): Remarkable new silicate structure. Nature 241, 42-43.

Wan, C., Ghose, S., and Gibbs, G.V. (1977) Rosenhahnite, Ca3Si3O8(OH)2: crystal structure and stereochemical configuration of the hydroxylated trisilicate group [Si3O8(OH)2]. American Mineralogist: 62: 503-512.

Zadov, A. E.; Chukanov, N. V.; Organova, N. I.; Kuz'mina, O. V.; Belakovskii, D. I.; Nechai, V. G.; Sokolovskii, F. S.; Kuznetsova, O. Yu. (2000): Comparative study of rosenhahnite from California and from the Urals. Improvement of the formula. Zapiski Vserossiiskogo Mineralogicheskogo Obshchestva 129, 85-96. (in Russian.)

Internet Links for Rosenhahnite

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    Localities for Rosenhahnite

    Hide Locality List
    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.
    Czech Republic
     
    • Moravia (Mähren; Maehren)
      • Vysočina Region
        • Havlíčkův Brod
    		Handbook of Mineralogy - Anthony, Bideaux, Bladh, Nichols
    Japan
     
    • Honshu Island
      • Chugoku Region
        • Hiroshima prefecture
    		Henmi, et al (1982) Sanko-Gakkai Kou\'en-Youshi, 154.
    • Shikoku Island
      • Kochi Prefecture
        • Kochi City
    		Handbook of Mineralogy - Anthony, Bideaux, Bladh, Nichols
          • Rendai
    		Mineralogical Journal Vol. 13 (1986) , No. 6 pp368-375
    New Zealand
     
    • North Island
      • Waikato
        • Piopio
    		Leach, T. M. & Rodgers, K. A. (1977): Rosenhahnite Ca3Si3O8(OH)2 - a further occurrence. Mineralogical Magazine 41, 394-395; Handbook of Mineralogy - Anthony, Bideaux, Bladh, Nichols
    Russia
     
    • Urals Region
      • Middle Urals
        • Ekaterinburgskaya (Sverdlovskaya) Oblast'
          • Asbest
    		Zadov, A. E.; Chukanov, N. V.; Organova, N. I.; Kuz'mina, O. V.; Belakovskii, D. I.; Nechai, V. G.; Sokolovskii, F. S.; Kuznetsova, O. Yu. (2000): Comparative study of rosenhahnite from California and from the Urals. Improvement of the formula. Zapiski Vserossiiskogo Mineralogicheskogo Obshchestva 129, 85-96. (in Russian.) ; [World of Stones 2:93 p35]
    USA
     
    • California
      • Mendocino Co.
        • Cloverdale
    		AM 52 (1967), 336; HB2/2 (1995); ZVMO 129/2 (2000), 85; AM 87 (2002), 184
    • North Carolina
      • Durham Co.
        • Durham
    		Handbook of Mineralogy - Anthony, Bideaux, Bladh, Nichols; Kenny Gay message 15.09.2005; Mineralogical Magazine 1977 41 : 394-395
    Mineral and/or Locality
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