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Stringhamite

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Formula:
CaCu(SiO4) · H2O
System:
Monoclinic
Colour:
Azure blue
Name:
For Bronson Ferrin Stringham (1907-1968) chair of department of mineralogy, University of Utah.
This page provides mineralogical data about Stringhamite.

Classification of Stringhamite

Approved 1974
9.AE.35

9 : SILICATES (Germanates)
A : Nesosilicates
E : Nesosilicates with additional anions (O,OH,F,H2O); cations in tetrahedral [4] coordination
78.1.9.1

78 : Unclassified Silicates
1 : Miscellaneous
14.2.10

14 : Silicates not Containing Aluminum
2 : Silicates of Cu
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First Recorded Occurrence of Stringhamite

Year of Discovery:
1974
Geological Setting of First Recorded Material:
In fractures near a contact between quartz monzonite and limestone

Physical Properties of Stringhamite

Vitreous
Diaphaneity (Transparency):
Transparent, Translucent
Colour:
Azure blue
Density:
3.16 - 3.18 g/cm3 (Measured)    3.67 g/cm3 (Calculated)

Crystallography of Stringhamite

Crystal System:
Monoclinic
Cell Parameters:
a = 5.02Å, b = 16.07Å, c = 5.3Å
β = 102.58°
Ratio:
a:b:c = 0.312 : 1 : 0.33
Unit Cell Volume:
V 417.29 ų (Calculated from Unit Cell)
Twinning:
All crystals are multiplied twinned

Crystallographic forms of Stringhamite

Crystal Atlas:
Image Loading
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Stringhamite - {101}, {011}, modified
3d models and HTML5 code kindly provided by www.smorf.nl.

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Edge Lines | Miller Indicies | Axes

Transparency
Opaque | Translucent | Transparent

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Along a-axis | Along b-axis | Along c-axis | Start rotation | Stop rotation

Optical Data of Stringhamite

Type:
Biaxial (+)
RI values:
nα = 1.709 nβ = 1.717 nγ = 1.729
2V:
Measured: 80° , Calculated: 80°
Max Birefringence:
δ = 0.020
Image shows birefringence interference colour range (at 30µm thickness) and does not take into account mineral colouration.
Surface Relief:
High
Dispersion:
r > v weak
Pleochroism:
Visible
Comments:
alpha - light grey blue
beta - light blue
gamma - dark blue

Chemical Properties of Stringhamite

Formula:
CaCu(SiO4) · H2O
Essential elements:
All elements listed in formula:
Common Impurities:
Al,Fe,Mg

Relationship of Stringhamite to other Species

9.AE.05BerylliteBe3(SiO4)(OH)2 · H2O
9.AE.10EuclaseBeAl(SiO4)(OH)
9.AE.15SverigeiteNaMnMgSnBe2(SiO4)3(OH)
9.AE.20HodgkinsoniteMn2+Zn2(SiO4)(OH)2
9.AE.25GerstmanniteMnMgZn(SiO4)(OH)2
9.AE.30ClinohedriteCaZn(SiO4) · H2O
9.AE.40Katoptrite(Mn2+,Mg)13(Al,Fe3+)4Sb25+(SiO4)2O20
9.AE.45YeatmaniteZn6Mn92+Sb25+(SiO4)4O12
9.AE.50SphaerobertranditeBe3(SiO4)(OH)2
14.2.1DioptaseCuSiO3 · H2O
14.2.2ShattuckiteCu5(Si2O6)2(OH)2
14.2.3PlancheiteCu8(Si8O22)(OH)4 · H2O
14.2.4GilaliteCu5Si6O17 · 7H2O
14.2.5ChrysocollaCu2-xAlx(H2-xSi2O5)(OH)4 · nH2O (x < 1)
14.2.6LitidioniteCuNaKSi4O10
14.2.7ReinhardbraunsiteCa5(SiO4)2(OH,F)2
14.2.8CuprorivaiteCaCu[Si4O10]
14.2.9KinoiteCa2Cu2(H2O)2[Si3O10]
14.2.11ApachiteCu9Si10O29 · 11H2O

Other Names for Stringhamite

Name in Other Languages:

Other Information

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

References for Stringhamite

Reference List:
Hindman, J. R. (1976): Stringhamite, a new calcium copper siliate from Utah. American Mineralogist (1976): 61: 189-192.

American Mineralogist (1986): 71: 231.

Tschermaks Mineralogische und Petrographische Mitteilungen (1985): 34: 15-24.

Internet Links for Stringhamite

Localities for Stringhamite

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 for a valid mineral species. (FRL) indicates first recorded locality for everything else. ? 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.
Chile
 
  • Atacama Region
    • Copiapó Province
Am.Min. 61:189
        • Punta del Cobre District
Bob Jenkins & M. Dini collections
Japan
 
  • Honshu Island
    • Chugoku Region
      • Okayama Prefecture
        • Takahashi City
          • Bicchu-cho (Bitchu-cho)
            • Fuka
Nishimura et al (2001) Koubutsu-Gakkai Kou'en-Youshi, 114.
USA
 
  • Arizona
    • Gila Co.
      • Dripping Spring Mts
        • Banner District
          • Christmas area
            • Christmas
Handbook of Mineralolgy Vol. II Silica, Silicates, Part 2 pg.760. Anthony, Bideaux, Bladh, Nichols.
Anthony, J.W., et al (1995), Mineralogy of Arizona, 3rd.ed.: 384-385.
    • Pima Co.
      • Sierrita Mts
        • Pima District (Olive District; Mineral Hill District; Twin Buttes District)
          • Twin Buttes
Anthony, J.W., et al (1995), Mineralogy of Arizona, 3rd.ed.: 268, 385.
  • California
    • Riverside Co.
      • Crestmore
Hindman, J.R. (1976) Stringhamite, a new hydrous calcium silicate from Utah. American Mineralogist: 61: 189-192; Pemberton, H. Earl (1983), Minerals of California; Van Nostrand Reinholt Press: 515; micromounts@yahoogroups.com
  • Utah
    • Beaver Co.
      • Rocky Range
        • Rocky District
Kampf, A. R., Mills, S. J., Merlino, S., Pasero, M., McDonald, A. M., Wray, W. B., & Hindman, J. R. (2012). Whelanite, Cu2Ca6 [Si6O17 (OH)](CO3)(OH) 3 (H2O) 2, an (old) new mineral from the Bawana mine, Milford, Utah. American Mineralogist, 97(11-12), 2007-2015.
Mineral and/or Locality  
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