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Putnisite

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Formula:
SrCa
 
4
Cr
3+
8
(CO
 
3
)
 
8
SO
 
4
(OH)
 
16
· 23H
 
2
O
System:OrthorhombicHardness:1 - 2
Name:
Named after Dr Christine Putnis and Prof Andrew Putnis, both University of Münster, Germany, for their outstanding contributions to mineralogy, especially phase transformations in minerals and mineral surface science (mainly crystal growth and dissolution processes).
This page provides mineralogical data about Putnisite.

Classification of Putnisite

IMA status:Approved 2012
mindat.org URL:http://www.mindat.org/min-42732.html
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Type Occurrence of Putnisite

Type Locality:Polar Bear peninsula (Lake Cowan), Norseman, Dundas Shire, Western Australia, Australia
General Appearance of Type Material:Ad isolated pseudocubic crystals up to 0.5 mm in size in a matrix composed of quartz and a near amorphous Cr silicate
Place of Conservation of Type Material:South Australian Museum, Adelaide, South Australia, Australia, registration number G33429
Canadian Museum of Nature, Ottawa, Canada, catalogue number CMNMC 86133

Physical Properties of Putnisite

Lustre:Vitreous
Diaphaneity (Transparency):Translucent
Streak:Pink
Hardness (Mohs):1 - 2
Tenacity:Brittle
Cleavage:Perfect
One excellent and two good cleavages parallel to {100}, {010} and {001}.
Fracture:Irregular/Uneven
Density (measured):2.20 g/cm3
Density (calculated):2.23 g/cm3

Crystallography of Putnisite

Crystal System:Orthorhombic
Class (H-M):mmm (2/m 2/m 2/m) - Dipyramidal
Space Group:Pnma
Space Group Setting:Pnma
Cell Parameters:a = 15.351(3) Å, b = 20.421(4) Å, c = 18.270(4) Å
Ratio:a:b:c = 0.752 : 1 : 0.895
Unit Cell Volume:V 5727 ų
Z:4
Morphology:Pseudocubic crystals
Comment:New structure type
X-Ray Powder Diffraction:
d-spacingIntensity
13.577 (100)
7.659 (80)
7.095 (10)
5.084 (19)
4.901 (13)
3.385 (7)
3.689 (16)
3.594 (7)

Optical Data of Putnisite

Type:Biaxial (-)
RI values: nα = 1.552(3) nβ = 1.583(3) nγ = 1.599(3)
Maximum Birefringence:δ = 0.047

Chart shows birefringence interference colour range (at 30µm thickness) and does not take into account mineral colouration.
Surface Relief:Moderate
Comments:Distinct: X pale bluish grey, Y pale purple, Z pale purple

Chemical Properties of Putnisite

Formula:
SrCa
 
4
Cr
3+
8
(CO
 
3
)
 
8
SO
 
4
(OH)
 
16
· 23H
 
2
O
Simplified for copy/paste:SrCa4Cr3+8(CO3)8SO4(OH)16·23H2O
Essential elements:C, Ca, Cr, H, O, S, Sr
All elements listed in formula:C, Ca, Cr, H, O, S, Sr
Analytical Data:Electron microprobe analysis (EMPA). Empirical formula based on O + Cl = 69
Na2O(0.17)
MgO(0.08)
CaO(10.81)
SrO(5.72)
BaO(0.12)
CuO(0.29)
Cr2O3(31.13)
SO3(3.95)
SiO2(0.08)
Cl–(0.28)
CO2(17.94) calc
H2O(30.30) calc
O=Cl–(0.06)
total 100.81
Empirical Formula:
Cr3+8.02Ca3.78Sr1.08Na0.11Cu2+0.07Mg0.04Ba0.02[(SO4)0.96(SiO4)0.03]0.99 (CO3)7.98(OH)16.19Cl0.15·24.84H2O

Other Names for Putnisite

Synonyms:
IMA2011-106
Other Languages:

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 Putnisite

Reference List:

- +
Elliott, P., Giester, G., Rowe, R., Pring, A. (2012) Putnisite, IMA 2011-106. CNMNC Newsletter No. 13, June 2012, page 810; Mineralogical Magazine, 76, 807-817.

Elliott, P., Giester, G., Rowe, R., Pring, A. (2014): Putnisite, SrCa4Cr3+8(CO3)8SO4(OH) 16·25H2O, a new mineral from Western Australia: description and crystal structure. Mineralogical Magazine, 78, 131-144

Internet Links for Putnisite

Search Engines:
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  • Raman and XRD data at RRUFF project
  • American Mineralogist Crystal Structure Database
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  • Localities for Putnisite

    (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.
    Australia
     
    • Western Australia
      • Coolgardie Shire
        • Widgiemooltha
    Steve Sorrell Collection
      • Dundas Shire
        • Norseman
    Elliott, P., Giester, G., Rowe, R., Pring, A. (2012) Putnisite, IMA 2011-106. CNMNC Newsletter No. 13, June 2012, page 810; Mineralogical Magazine, 76, 807-817; Elliott, P., Giester, G., Rowe, R. & Pring, A. (2014): Putnisite, SrCa4Cr3+8(CO3)8SO4(OH)16•25H2O, a new mineral from Western Australia: description and crystal structure. Mineral. Mag. 78, 131-144.
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    Copyright © Jolyon Ralph and Ida Chau 1993-2014. Site Map. Locality, mineral & photograph data are the copyright of the individuals who submitted them. 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 thousands of members and supporters. Mindat does not offer minerals for sale. If you would like to add information to improve the quality of our database, then click here to register.
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