Stringhamite Mineral Data

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General Stringhamite Information

Chemical Formula:

CaCuSiO4•2(H2O)

Composition:

Molecular Weight = 231.74 gm

Calcium 17.29 % Ca 24.20 % CaO

Copper 27.42 % Cu 34.33 % CuO

Silicon 12.12 % Si 25.93 % SiO₂

Hydrogen 1.74 % H 15.55 % H₂O

Oxygen 41.42 % O

______ ______

100.00 % 100.00 % = TOTAL OXIDE

Empirical Formula:

CaCu(SiO₄)•2(H₂O)

Environment:

Found with secondary and primary copper minerals in a diopside-magnetite skarn.

IMA Status:

Approved IMA 1976

Locality:

Bawana mine, near Milford, Beaver County, Utah. Link to MinDat.org Location Data.

Name Origin:

Named for Bronson F. Stringham (1907-1968), University of Utah.

Name Pronunciation:

Stringhamite + Pronunciation

Synonym:

ICSD 30926

PDF 29-318

Stringhamite Image

Images:

Click Here for Larger Stringhamite Image

Stringhamite Wollastonite-1A

Comments: Rounded aggregate of dark blue stringhamite crystals on bladed, white wollastonite.
Location: Christmas mine, Hayden, Gila County, Arizona, USA. Scale: Not Given.
© Lou Perloff / Photo Atlas of Minerals

Stringhamite Crystallography

Axial Ratios:

a:b:c =0.3117:1:0.3311

Cell Dimensions:

a = 5.03, b = 16.135, c = 5.343, Z = 4; beta = 102.96° V = 422.59 Den(Calc)= 3.64

Crystal System:

Monoclinic - PrismaticH-M Symbol (2/m) Space Group: P 2₁/c

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

By Intensity(I/I_o): 2.768(1), 2.523(0.4), 3.236(0.39),

Crystal Structure:

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Hawthorne F C , Tschermaks Mineralogische und Petrographische Mitteilungen , 34 (1985) p.15-24, The crystal structure of stringhamite, Locality: Christmas mine, Pinal County, Arizona, USA

Physical Properties of Stringhamite

Cleavage:

{001} Good, {100} Imperfect

Color:

Azure, Blue violet, Dark blue.

Density:

3.67

Diaphaneity:

Transparent to Translucent

Habit:

Aggregates - Made of numerous individual crystals or clusters.

Luster:

Vitreous (Glassy)

Streak:

light blue

Optical Properties of Stringhamite

Gladstone-Dale:

CI meas= 0.094 (Poor) - where the CI = (1-KPDmeas/KC)
CI calc= 0.086 (Poor) - where the CI = (1-KPDcalc/KC)
KPDcalc= 0.1973,KPDmeas= 0.1957,KC= 0.216
Ncalc = 1.79

Optical Data:

Biaxial (+), a=1.709, b=1.717, g=1.729, bire=0.0200, 2V(Calc)=80, 2V(Meas)=80.

Pleochroism (x):

dark blue.

Pleochroism (y):

blue.

Pleochroism (z):

light blue.

Calculated Properties of Stringhamite

Electron Density:

Bulk Density (Electron Density)=3.61 gm/cc
note: Specific Gravity of Stringhamite =3.64 gm/cc.

Fermion Index:

Fermion Index = 0.0060947417
Boson Index = 0.9939052583

Photoelectric:

PE_Stringhamite= 14.29 barns/electron
U=PE_Stringhamite x rElectron Density= 51.61 barns/cc.

Radioactivity:

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

Stringhamite Classification

Dana Class:

78.01.09.01 (78)Unclassified silicates

(78.01)possible nesosilicates

(78.01.09)Dana Group

78.01.09.01 Stringhamite CaCuSiO4•2(H2O) P 2₁/c 2/m

Strunz Class:

09.AE.35 09 - SILICATES (Germanates)

09.A - Nesosilicates

09.AE -Nesosilicates with additional (O,OH,F,H2O);

09.AE.35 Stringhamite CaCuSiO4•2(H2O) P 2₁/c 2/m

Other Stringhamite Information

References:

NAME( Dana8) PHYS. PROP.(Dana8) OPTIC PROP.(Dana8)

See Also:

Links to other databases for Stringhamite :
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 Stringhamite 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 Stringhamite Specimen Label here :

Stringhamite

CaCuSiO4•2(H2O)
Dana No: 78.01.09.01 Strunz No: 09.AE.35
Locality:

Notes: