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Stringhamite

Big Photo

Christmas Mine (Red Bird shafts; Inspiration Mine; Hackberry shafts), Christmas, Christmas area, Banner District, Dripping Spring Mts, Gila Co., Arizona, USA
© Wm. Wise (2006)

Show Stringhamite Photos (7)
Formula:
CaCu[SiO
 
4
] · H
 
2
O
System:MonoclinicColour: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

IMA status:Approved 1974
Strunz 8th edition ID:8/B.03-40
Nickel-Strunz 10th (pending) edition ID:9.AE.35

9 : SILICATES (Germanates)
A : Nesosilicates
E : Nesosilicates with additional anions (O,OH,F,H2O); cations in tetrahedral [4] coordination
Dana 8th edition ID:78.1.9.1

78 : Unclassified Silicates
1 : Miscellaneous
Hey's CIM Ref.:14.2.10

14 : Silicates not Containing Aluminum
2 : Silicates of Cu
mindat.org URL:http://www.mindat.org/min-3802.html
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Type Occurrence of Stringhamite

Type Locality:Bawana Mine (Old Hickory mine), Rocky District, Rocky Range, Beaver Co., Utah, USA
Year of Discovery:1976
Geological Setting of type material:In fractures near a contact between quartz monzonite and limestone

Physical Properties of Stringhamite

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

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
Crystal Atlas:
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Stringhamite - {101}, {011}, modified

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The mindat.org Crystal Atlas allows you to view a selection of crystal drawings of real and idealised crystal forms for this mineral and, in certain cases, 3d rotating crystal objects. You need Java to see these. You can download Java for free - click here to download Java

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Optical Data of Stringhamite

Type:Biaxial (+)
RI values: nα = 1.709 nβ = 1.717 nγ = 1.729
2V:Measured: 80° , Calculated: 80°
Maximum Birefringence:δ = 0.020

Chart 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[SiO
 
4
] · H
 
2
O
Essential elements:Ca, Cu, H, O, Si
All elements listed in formula:Ca, Cu, H, O, Si
Common Impurities:Al,Fe,Mg

Relationship of Stringhamite to other Species

Related Minerals - Nickel-Strunz Grouping):

- +
9.AE.05Beryllite
Be
 
3
[(OH)
 
2
|SiO
 
4
] · H
 
2
O
9.AE.10Euclase
BeAl[OH|SiO
 
4
]
9.AE.15Sverigeite
NaMnMgSnBe
 
2
Si
 
3
O
 
12
(OH)
9.AE.20Hodgkinsonite
Mn
2+
 
Zn
 
2
[(OH)
 
2
|SiO
 
4
]
9.AE.25Gerstmannite
(Mg,Mn
2+
 
)Zn[(OH)
 
2
|SiO
 
4
]
9.AE.30Clinohedrite
CaZn[SiO
 
4
] · H
 
2
O
9.AE.40Katoptrite
(Mn
2+
 
,Mg)
 
13
(Al,Fe
3+
 
)
 
4
Sb
5+
2
[O
 
10
|SiO
 
4
]
 
2
9.AE.45Yeatmanite
Mn
2+
7
Zn
 
8
Sb
5+
2
[O
 
3
|SiO
 
4
]
 
4
9.AE.50Sphaerobertrandite
Be
 
3
SiO
 
4
(OH)
 
2
Related Minerals - Hey's Index Grouping:

- +
14.2.1Dioptase
Cu
 
6
(Si
 
6
O
 
18
)·6H
 
2
O
14.2.2Shattuckite
Cu
 
5
[(OH)
 
2
|(SiO
 
3
)
 
4
]
14.2.3Plancheite
Cu
 
8
[(OH)
 
4
|Si
 
8
O
 
22
] · H
 
2
O
14.2.4Gilalite
Cu
 
5
Si
 
6
O
 
17
·7H
 
2
O
14.2.5Chrysocolla
(Cu,Al)
 
2
H
 
2
Si
 
2
O
 
5
(OH)
 
4
·nH
 
2
O
14.2.6Litidionite
CuNaKSi
 
4
O
 
10
14.2.7Reinhardbraunsite
Ca
 
5
[(OH,F)
 
2
|(SiO
 
4
)
 
2
]
14.2.8Cuprorivaite
CaCu[Si
 
4
O
 
10
]
14.2.9Kinoite
Ca
 
2
Cu
 
2
(H
 
2
O)
 
2
[Si
 
3
O
 
10
]
14.2.11Apachite
Cu
 
9
Si
 
10
O
 
29
·11H
 
2
O

Other Names for Stringhamite

Synonyms:
IMA1974-007
Other Languages:
German:Stringhamit
Russian:Стрингхамит
Spanish:Stringhamita

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 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

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  • Raman and XRD data at RRUFF project
  • American Mineralogist Crystal Structure Database
  • Search for Stringhamite in the Natural History Museum (London) online catalogue
  • Stringhamite details from Handbook of Mineralogy (PDF)
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    Localities for Stringhamite

    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.
    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
            • Bitchu-cho (Bicchu-cho)
    		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
    		[micromounts@yahoogroups.com]; Am Min 61: 189-192.
    • Utah
      • Beaver Co.
        • Rocky Range
          • Rocky District
    		Am Min 61:3-4 pp 189-192
    Mineral and/or Locality
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    Copyright © Jolyon Ralph and Ida Chau 1993-2009. Site Map. Locality, mineral & photograph data are the copyright of the individuals who submitted them.Further information contact the Site hosted & developed by Jolyon Ralph. Mindat.org is an online information resource dedicated to providing free mineralogical information to all. Mindat relies on the contributions of hundreds of members and supporters. If you would like to add information to improve the quality of our database, then click here to register. Current server date and time: 10th Nov 2009 06:44:44