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Putnisite

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Christine and Andrew Putnis
Formula:
SrCa4Cr83+(CO3)8SO4(OH)16 · 23H2O
System:
Orthorhombic
Hardness:
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

Approved 2012
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First Recorded Occurrence of Putnisite

General Appearance of First Recorded 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 First Recorded 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

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:
2.20 g/cm3 (Measured)    2.23 g/cm3 (Calculated)

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 Data:
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)
Max Birefringence:
δ = 0.047
Image 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:
SrCa4Cr83+(CO3)8SO4(OH)16 · 23H2O
Essential elements:
All elements listed in formula:
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

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 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

Localities for Putnisite

(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.
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.
Mineral and/or Locality  
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