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Raygrantite

This page kindly sponsored by Mineralogical Society of Arizona
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About RaygrantiteHide

Ray Grant
Formula:
Pb10Zn(SO4)6(SiO4)2(OH)2
Colour:
Colourless
Lustre:
Vitreous
Hardness:
3
Specific Gravity:
6.374 (Calculated)
Crystal System:
Triclinic
Member of:
Name:
Named after Dr. Raymond W. Grant (b. October 25, 1939), retired professor of geology, Founder and Curator Pinal Geology and Mineral Museum, Founder and President Pinal Gem & Mineral Society, Life Member and Past President Mineralogical Society of Arizona, Past Chairman Flagg Mineral Foundation, mineralogist, author of Mineralogy of Arizona (1995) and thumbnail mineral collector, Florence, Arizona.
Isostructural with:
The S (or sulfate) analogue of hemihedrite, and S-Zn analogue of iranite.

The crystal structure consists of slabs || (120), which contain sulfate and silicate tetrahedra and ZnO4(OH)2 octahedra. Pb cations held those polyhedra together. There is a wide range of Pb–O bond distances.


Classification of RaygrantiteHide

Approved
Approval Year:
2013
First Published:
2017

Pronounciation of RaygrantiteHide

Pronounciation:
PlayRecorded byCountry
Jolyon & Katya RalphUnited Kingdom

Physical Properties of RaygrantiteHide

Vitreous
Transparency:
Transparent
Colour:
Colourless
Streak:
White
Hardness:
Comment:
Ca. 3
Tenacity:
Brittle
Cleavage:
Distinct/Good
on {120}
Parting:
Not observed
Density:
6.374 g/cm3 (Calculated)

Optical Data of RaygrantiteHide

Type:
Biaxial (+)
RI values:
nα = 1.915(7) nβ = 1.981(7) nγ = 2.068(9)
2V:
Measured: 76° (2), Calculated: 85°
Max Birefringence:
δ = 0.153
Image shows birefringence interference colour range (at 30µm thickness)
and does not take into account mineral colouration.
Surface Relief:
Very High

Chemical Properties of RaygrantiteHide

Formula:
Pb10Zn(SO4)6(SiO4)2(OH)2

Crystallography of RaygrantiteHide

Crystal System:
Triclinic
Class (H-M):
1 - Pinacoidal
Space Group:
P1
Cell Parameters:
a = 9.3175(4) Å, b = 11.1973(5) Å, c = 10.8318(5) Å
α = 120.374(2)°, β = 90.511(2)°, γ = 56.471(2)°
Ratio:
a:b:c = 0.832 : 1 : 0.967
Unit Cell V:
753.13 ų
Twinning:
Fish-tail type, pervasive on (1 2 -1)

X-Ray Powder DiffractionHide

Powder Diffraction Data:
d-spacingIntensity
4.753(56)
4.288(32)
3.267(63)
3.102(100)
2.996(29)
2.851(35)
2.783(31)
2.707(31)
Comments:
From Type Description.

Type Occurrence of RaygrantiteHide

General Appearance of Type Material:
Bladed crystals with striations || c
Place of Conservation of Type Material:
Type material is deposited in the collections of the University of Arizona Mineral Museum, Tucson, Arizona, USA, catalogue number 19345, and the RRUFF Project, deposition number R120151
Associated Minerals at Type Locality:

Synonyms of RaygrantiteHide

Relationship of Raygrantite to other SpeciesHide

Member of:
Other Members of this group:
HemihedritePb10Zn(CrO4)6(SiO4)2(OH)2Tric.
IranitePb10Cu(CrO4)6(SiO4)2(OH)2Tric.

Other InformationHide

Notes:
Insoluble in water, acetone or HCl acid
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 RaygrantiteHide

Reference List:
Sort by Year (asc) | by Year (desc) | by Author (A-Z) | by Author (Z-A)
Yang, H., Andrade, M.B., Downs, R.T., Gibbs, R.B. and Jenkins. R.A. (2013) Raygrantite, IMA 2013-001. CNMNC Newsletter No. 16, August 2013, page 2700; Mineralogical Magazine, 77: 2695-2709.
Yang, H., Andrade, M.B., Downs, R.T., Gibbs, R.B., Jenkins, R.A. (2016): Raygrantite, Pb10Zn(SO4)6(SiO4)2(OH)2, a new mineral isostructural with iranite, from Big Horn Mountains, Maricopa County, Arizona, USA. Canadian Mineralogist: 54: 625-634.

Internet Links for RaygrantiteHide

Localities for RaygrantiteHide

ⓘ - 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.
USA (TL)
 
  • Arizona
    • Maricopa Co.
      • Big Horn Mts
        • Osborn District
          • Tonopah
            • Belmont Mountain
              • Tiger Wash
Yang, H., Andrade, M.B., Downs, R.T., Gibbs, R.B. and Jenkins. R.A. (2013) Raygrantite, IMA 2013-001. CNMNC Newsletter No. 16, August 2013, page 2700; Mineralogical Magazine, 77, 2695-2709.; Yang, H., Andrade, M.B., Downs, R.T., Gibbs, R.B., Jenkins, R.A. (2016): Raygrantite, Pb10Zn(SO4)6(SiO4)2(OH)2, a new mineral isostructural with iranite, from Big Horn Mountains, Maricopa County, Arizona, USA. Canadian Mineralogist: 54: 625-634.
Mineral and/or Locality  
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