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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).
Unique combination of elements. The first mineral combining strontium and chromium; also the first strontium-bearing carbonate-sulfate mineral.

Not directly related to any natural or synthetic compound.

Crystal structure details/elements:
(1) Cr(OH)4O2 octahedra, that share edges to form an eight-membered ring;
(2) [10]Sr atoms are localized at centres the rings;
(3) carbonate group triangles surround the rings; each carbonate group share corners with two Cr-bearing octahedra;
(4) Ca(H2O)4O4 polyhedra link together to form a sheet || (100);
(5) adjacent sheets are linked along [100] by sulfate tetrahedra that share corners; (6) channels along [100] and inter-slab space hold water molecules;
(7) hydrogen bonds, moderate to weak, stand for an additional link fot the slabs.

Classification of Putnisite

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

General Appearance of Type Material:
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
Associated Minerals at Type Locality:

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
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
Common Impurities:
Na,Cl,Cu

Relationship of Putnisite to other Species

Common Associates:

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

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.
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. Mineralogical Magazine 78, 131-144.
Mineral and/or Locality  
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