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Putnisite

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Christine and Andrew Putnis
Formula:
SrCa4Cr3+8(CO3)8SO4(OH)16 · 23H2O
Lustre:
Vitreous
Hardness:
1 - 2
Specific Gravity:
2.20
Crystal System:
Orthorhombic
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.


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Classification of PutnisiteHide

Approved
Approval Year:
2012

Physical Properties of PutnisiteHide

Vitreous
Transparency:
Translucent
Streak:
Pink
Hardness:
1 - 2 on Mohs scale
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)

Optical Data of PutnisiteHide

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 PutnisiteHide

Formula:
SrCa4Cr3+8(CO3)8SO4(OH)16 · 23H2O
IMA Formula:
SrCa4Cr3+8(CO3)8SO4(OH)16 · 25H2O
Common Impurities:
Na,Cl,Cu

Crystallography of PutnisiteHide

Crystal System:
Orthorhombic
Class (H-M):
mmm (2/m 2/m 2/m) - Dipyramidal
Space Group:
Pnma
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 V:
5727 ų
Z:
4
Morphology:
Pseudocubic crystals
Comment:
New structure type

X-Ray Powder DiffractionHide

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)

Type Occurrence of PutnisiteHide

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:

Synonyms of PutnisiteHide

Other Language Names for PutnisiteHide

Common AssociatesHide

Associated Minerals Based on Photo Data:
Quartz1 photo of Putnisite associated with Quartz on mindat.org.
Gypsum1 photo of Putnisite associated with Gypsum on mindat.org.

Other InformationHide

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 PutnisiteHide

Reference List:
Sort by Year (asc) | by Year (desc) | by Author (A-Z) | by Author (Z-A)
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 PutnisiteHide

Localities for PutnisiteHide

This 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.

Locality ListHide

- This locality has map coordinates listed. - This locality has estimated coordinates. ⓘ - Click for further information on this occurrence. ? - Indicates mineral may be doubtful at this locality. - Good crystals or important locality for species. - World class for species or very significant. (TL) - Type Locality for a valid mineral species. (FRL) - First Recorded Locality for everything else (eg varieties). Struck out - Mineral was erroneously reported from this locality. Faded * - Never found at this locality but inferred to have existed at some point in the past (eg from pseudomorphs.)

All localities listed without proper references should be considered as questionable.
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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