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Wayneburnhamite

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About WayneburnhamiteHide

Formula:
Pb9Ca6(Si2O7)3(SiO4)3
previously written as Pb9Ca6(Si2O7)4(SiO4)O
Colour:
sky-blue
Lustre:
Vitreous, Resinous
Hardness:
Specific Gravity:
5.271 (Calculated)
Crystal System:
Hexagonal
Isostructural with:
The Ca (or rather Ca6-) analogue of ganomalite. Apatite polysome.

The only purely Pb-Ca hydrogen- and halogen-devoid silicate mineral. Chemically slightly similar to nasonite. Representative of a very small group of minerals with the P-6 space group. The structure of the mineral is determined. The only difference from ganomalite is that the site occupied mainly by Mn in ganomalite is occupied here by Ca.


Classification of WayneburnhamiteHide

Approved, Pending publication

Pronounciation of WayneburnhamiteHide

Pronounciation:
PlayRecorded byCountry
Jolyon & Katya RalphUnited Kingdom

Physical Properties of WayneburnhamiteHide

Vitreous, Resinous
Transparency:
Transparent, Translucent
Colour:
sky-blue
Streak:
white
Hardness:
3½ on Mohs scale
Tenacity:
Brittle
Cleavage:
None Observed
Fracture:
Conchoidal
Density:
5.271 g/cm3 (Calculated)

Optical Data of WayneburnhamiteHide

Type:
Uniaxial (+)
RI values:
nω = 1.855() nε = 1.875(5)
Max Birefringence:
δ = 0.020
Image shows birefringence interference colour range (at 30µm thickness)
and does not take into account mineral colouration.
Surface Relief:
Very High
Pleochroism:
Weak
Comments:
sky blue (E) to lighter sky blue (O), E > O

Chemical Properties of WayneburnhamiteHide

Formula:
Pb9Ca6(Si2O7)3(SiO4)3

previously written as Pb9Ca6(Si2O7)4(SiO4)O

Crystallography of WayneburnhamiteHide

Crystal System:
Hexagonal
Class (H-M):
6 - Trigonal Dipyramidal
Space Group:
P6
Cell Parameters:
a = 9.8953(9) Å, c = 10.2054(7) Å
Ratio:
a:c = 1 : 1.031
Unit Cell V:
865.4 ų
Z:
1

X-Ray Powder DiffractionHide

Powder Diffraction Data:
d-spacingIntensity
4.95(52)
4.45(64)
3.550(77)
3.232(54)
3.086(100)
2.847(60)
2.798(48)
2.734(83)

Synonyms of WayneburnhamiteHide

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 WayneburnhamiteHide

Reference List:
Sort by Year (asc) | by Year (desc) | by Author (A-Z) | by Author (Z-A)
Kampf, A.R., Housley, R.M., Rossman, G.R. (2016): Wayneburnhamite, IMA 2015-124. CNMNC Newsletter No. 31, June 2016, page 693; Mineralogical Magazine: 80: 691–697
Kampf, A.R., Housley, R.M., Rossman, G.R. (2016): Wayneburnhamite, Pb9Ca6(Si2O7)3(SiO4)3, an apatite polysome – the Mn-free analogue of ganomalite from Crestmore, California. American Mineralogist 101, 2423-2429.

Internet Links for WayneburnhamiteHide

Localities for WayneburnhamiteHide

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.
USA
 
  • California
    • Riverside Co.
      • Crestmore
        • Crestmore quarries
          • Sky Blue Hill
Kampf, A.R., Housley, R.M., Rossman, G.R. (2016): Wayneburnhamite, IMA 2015-124. CNMNC Newsletter No. 31, June 2016, page 693; Mineralogical Magazine: 80: 691–697; http://forum.amiminerals.it/viewtopic.php?f=5&t=12867 (2016)
Mineral and/or Locality  
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