Rosenhahnite Mineral Data

General Rosenhahnite Information

Chemical Formula:

Ca3Si3O8[(OH)2-4x,(CO3)x]

Composition:

Molecular Weight = 370.80 gm

Calcium 32.43 % Ca 45.37 % CaO

Silicon 22.72 % Si 48.61 % SiO₂

Hydrogen 0.52 % H 4.62 % H₂O

Carbon 0.32 % C 1.19 % CO₂

Oxygen 44.01 % O

______ ______

100.00 % 99.78 % = TOTAL OXIDE

Empirical Formula:

Ca₃Si₃O₈(OH)_1.9(CO₃)_0.1

Environment:

High pressure metamorphic mineral found in graywackes and serpentinites.

IMA Status:

Approved IMA 1967

Locality:

Russian River, 5 miles NNW of Colverdale, Mendocino Co., California. Link to MinDat.org Location Data.

Name Origin:

Named for Leo Rosenhahn (1904-1991), American amateur mineralogist, who found the mineral.

Name Pronunciation:

Rosenhahnite + Pronunciation

Synonym:

ICSD 100074

PDF 29-378

Rosenhahnite Image

Images:

Rosenhahnite

Comments: Crystalline massive rosenhahnite.
Location: Near Healdsburg, Mendocino County, California, USA. Scale: See Photo.
© Jeff Weissman / Photographic Guide to Mineral Species

Rosenhahnite Crystallography

Axial Ratios:

a:b:c =0.7333:1:0.7182

Cell Dimensions:

a = 6.955, b = 9.484, c = 6.812, Z = 2; alpha = 108.64°, beta = 94.84°, gamma = 95.89° V = 422.00 Den(Calc)= 2.92

Crystal System:

Triclinic - PinacoidalH-M Symbol ( 1) Space Group: P1

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

By Intensity(I/I_o): 3.201(1), 2.965(0.9), 3.043(0.6),

Crystal Structure:

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

Physical Properties of Rosenhahnite

Cleavage:

{001} Perfect, {100} Good, {010} Good

Color:

Beige white, Colorless.

Density:

2.89 - 2.92, Average = 2.9

Diaphaneity:

Transparent to Translucent

Habit:

Tabular - Form dimensions are thin in one direction.

Hardness:

4.5-5 - Near Apatite

Luminescence:

Fluorescent, Short UV=yellowish green, Long UV=light orangish pink.

Luster:

Vitreous (Glassy)

Streak:

white

Optical Properties of Rosenhahnite

Gladstone-Dale:

CI meas= -0.021 (Excellent) - where the CI = (1-KPDmeas/KC)
CI calc= -0.012 (Superior) - where the CI = (1-KPDcalc/KC)
KPDcalc= 0.2172,KPDmeas= 0.2191,KC= 0.2146
Ncalc = 1.62 - 1.63

Optical Data:

Biaxial (-), a=1.608-1.625, b=1.64-1.65, g=1.646-1.65, bire=0.0250-0.0380

Pleochroism (x):

colorless.

Pleochroism (y):

colorless.

Pleochroism (z):

colorless.

Calculated Properties of Rosenhahnite

Electron Density:

Bulk Density (Electron Density)=2.94 gm/cc
note: Specific Gravity of Rosenhahnite =2.93 gm/cc.

Fermion Index:

Fermion Index = 0.01
Boson Index = 0.99

Photoelectric:

PE_Rosenhahnite= 4.84 barns/electron
U=PE_Rosenhahnite x rElectron Density= 14.24 barns/cc.

Radioactivity:

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

Rosenhahnite Classification

Dana Class:

57.01.04.01 (57)Sorosilicate Insular Si3O10 and Larger Noncyclic Groups

(57.01)with [Si3O10] groups

(57.01.04)Dana Group

57.01.04.01 Rosenhahnite Ca3Si3O8[(OH)2-4x,(CO3)x] P1 1

Strunz Class:

09.BJ.10 09 - SILICATES (Germanates)

09.B - Sorosilicates

09.BJ -Sorosilicates with Si3O10, Si4O11, etc

09.BJ.10 Rosenhahnite Ca3Si3O8[(OH)2-4x,(CO3)x] P1 1

Other Rosenhahnite Information

References:

NAME( MinRec) PHYS. PROP.(Enc. of Minerals,2nd ed.,1990) OPTIC PROP.(Dana8)

See Also:

Links to other databases for Rosenhahnite :
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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Ask about Rosenhahnite here :
Ask-A-Mineralogist from the Mineralogical Society of America
Mindat.org's Discussion Groups
Original Rockhounds Discussion Group
Rockhounds Discussion Group on Yahoo Groups
Mineral Discussion Forum from Fabre Minerals - also available in Español

Print or Cut-and-Paste your Rosenhahnite Specimen Label here :

Rosenhahnite

Ca3Si3O8[(OH)2-4x,(CO3)x]
Dana No: 57.01.04.01 Strunz No: 09.BJ.10
Locality:

Notes: