Reynoldsite
A valid IMA mineral species
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About Reynoldsite
Bob Reynolds
Formula:
Pb2Mn4+2O5(CrO4)
Colour:
Dark orange-brown to black
Lustre:
Adamantine
Hardness:
4½
Specific Gravity:
6.574 (Calculated)
Crystal System:
Triclinic
Name:
Named in 2011 by Anthony R. Kampf, Stuart J. Mills, R. M. Housley, Ralph S. Bottrill and Uwe Kolitsch in honour of Robert E. Reynolds [b. 1943], former Curator of Earth Sciences at the San Bernardino County Museum. He has written/edited numerous publications on the Mojave Desert region and supported a study of the Blue Bell claims, including the mineralogy.
This page provides mineralogical data about Reynoldsite.
Unique Identifiers
Mindat ID:
42233
Long-form identifier:
mindat:1:1:42233:2
IMA Classification of Reynoldsite
Classification of Reynoldsite
7.FB.30
7 : SULFATES (selenates, tellurates, chromates, molybdates, wolframates)
F : Chromates
B : With additional O,V, S, Cl
7 : SULFATES (selenates, tellurates, chromates, molybdates, wolframates)
F : Chromates
B : With additional O,V, S, Cl
Mineral Symbols
As of 2021 there are now IMA–CNMNC approved mineral symbols (abbreviations) for each mineral species, useful for tables and diagrams.
| Symbol | Source | Reference for Standard |
|---|---|---|
| Ryn | IMA–CNMNC | Warr, L.N. (2021). IMA–CNMNC approved mineral symbols. Mineralogical Magazine, 85(3), 291-320. doi:10.1180/mgm.2021.43 |
Pronunciation of Reynoldsite
Pronunciation:
| Play | Recorded by | Country |
|---|---|---|
| Jolyon Ralph | United Kingdom |
Physical Properties of Reynoldsite
Adamantine
Transparency:
Translucent
Colour:
Dark orange-brown to black
Comment:
The orange-brown color is only seen in very thin crystals in strong transmitted light.
Streak:
Dark orange-brown
Hardness:
4½ on Mohs scale
Tenacity:
Brittle
Cleavage:
Poor/Indistinct
Parallel to {001}
Parallel to {001}
Fracture:
Irregular/Uneven, Splintery
Density:
6.574 g/cm3 (Calculated)
Comment:
Could not be measured due to lack of material.
Optical Data of Reynoldsite
Type:
Biaxial
Optical Extinction:
Extinction is approximately parallel to [100], the direction of prism elongation for Blue Bell crystals and of the plate edges of Red Lead crystals.
Pleochroism:
Visible
Comments:
Medium brown along [100] to dark orange-brown along [010]*
Comments:
The Gladstone-Dale relationship predicts n_average = 2.473 for the ideal formula.
Chemistry of Reynoldsite
Mindat Formula:
Pb2Mn4+2O5(CrO4)
Element Weights:
Elements listed:
Crystallography of Reynoldsite
Crystal System:
Triclinic
Class (H-M):
1 - Pinacoidal
Space Group:
P1
Cell Parameters:
a = 5.0278(7) Å, b = 7.5865(11) Å, c = 10.2808(15) Å
α = 91.968(10)°, β = 99.405(12)°, γ = 109.159(10)°
α = 91.968(10)°, β = 99.405(12)°, γ = 109.159(10)°
Ratio:
a:b:c = 0.663 : 1 : 1.355
Unit Cell V:
363.81 ų (Calculated from Unit Cell)
Z:
2
Morphology:
Thin prisms, elongated parallel to [100] with a square cross section and a chisel-like termination.
Twinning:
Multiple penetration and reticulated twinning by rotations on [100] and [120] and about the normal to {001}.
Crystal Structure
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2x2x2 | 3x3x3 | 4x4x4
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Data courtesy of the American Mineralogist Crystal Structure Database. Click on an AMCSD ID to view structure
| ID | Species | Reference | Link | Year | Locality | Pressure (GPa) | Temp (K) |
|---|---|---|---|---|---|---|---|
| 0019062 | Reynoldsite | Kampf A R, Mills S J, Housley R M, Bottrill R S, Kolitsch U (2012) Reynoldsite, Pb2Mn4+2O5(CrO4), a new phyllomanganate-chromate from the Blue Bell claims, California and the Red Lead mine, Tasmania American Mineralogist 97 1187-1192 | 2012 | Baker, San Bernardino County, California, U.S.A. | 0 | 293 |
CIF Raw Data - click here to close
X-Ray Powder Diffraction
Powder Diffraction Data:
| d-spacing | Intensity |
|---|---|
| 3.427 Å | (52) |
| 3.254 Å | (85) |
| 3.052 Å | (100) |
| 2.923 Å | (40) |
| 2.502 Å | (47) |
| 1.982 Å | (42) |
| 1.769 Å | (36) |
| 1.637 Å | (36) |
Comments:
Red Lead Mine, Tasmania, Australia. Data from the type description.
Geological Environment
Paragenetic Mode(s):
| Paragenetic Mode | Earliest Age (Ga) |
|---|---|
| Stage 7: Great Oxidation Event | <2.4 |
| 47e : [Vanadates, chromates, manganates] | |
| 47h : [Near-surface oxidized, dehydrated minerals] |
Type Occurrence of Reynoldsite
Co-Type Localities:
General Appearance of Type Material:
Subparallel growths and divergent sprays of thin prisms with a square cross section and a chisel-like termination. Also as thin rectangular blades.
Place of Conservation of Type Material:
Four cotype specimens are deposited in the Natural History Museum of Los Angeles County under catalog numbers 63559, 63560, and 63561 (Blue Bell claims) and 63562 (Red Lead mine).
Geological Setting of Type Material:
Oxidation zone.
Associated Minerals at Type Locality:
Synonyms of Reynoldsite
Other Language Names for Reynoldsite
Dutch:Reynoldsiet
German:Reynoldsit
Common Associates
Associations Based on Photo Data:
| 12 photos of Reynoldsite associated with Pyromorphite | Pb5(PO4)3Cl |
| 6 photos of Reynoldsite associated with Fluorite | CaF2 |
| 4 photos of Reynoldsite associated with Fluorphosphohedyphane | Ca2Pb3(PO4)3F |
| 4 photos of Reynoldsite associated with Opal | SiO2 · nH2O |
| 4 photos of Reynoldsite associated with Wulfenite | Pb(MoO4) |
| 2 photos of Reynoldsite associated with Lithiophorite | (Al,Li)MnO2(OH)2 |
| 2 photos of Reynoldsite associated with Coronadite | Pb(Mn4+6Mn3+2)O16 |
| 1 photo of Reynoldsite associated with Crocoite | PbCr6+O4 |
Related Minerals - Strunz-mindat Grouping
| 7.FB.05 | Georgerobinsonite | Pb4(CrO4)2(OH)2FCl |
| 7.FB.05 | Phoenicochroite | Pb2(CrO4)O |
| 7.FB.10 | Santanaite | Pb11(CrO4)O12 |
| 7.FB.15 | Wattersite | [Hg2]2+2Hg2+[CrO4]O2 |
| 7.FB.20 | Deanesmithite | [Hg2]2+Hg2+3[CrO4]S2O |
| 7.FB.25 | Edoylerite | Hg2+3(CrO4)S2 |
Fluorescence of Reynoldsite
Not fluorescent.
Other Information
Notes:
Dissolves slowly in concentrated HCl.
Health Risks:
No information on health risks for this material has been entered into the database. You should always treat mineral specimens with care.
Internet Links for Reynoldsite
mindat.org URL:
https://www.mindat.org/min-42233.html
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References for Reynoldsite
Reference List:
Williams, P. A., Hatert, F., Pasero, M., Mills, S. J. (2011) New minerals and nomenclature modifications approved in 2011, CNMNC Newsletter No. 10. Mineralogical Magazine, 75 (5) 2549-2561 doi:10.1180/minmag.2011.075.5.2549
Localities for Reynoldsite
Showing 5 localities.
symbol to view information about a locality.
The Locality List
- This locality has map coordinates listed.
- This locality has estimated coordinates.
ⓘ - Click for references and 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).
All localities listed without proper references should be considered as questionable.
Australia (TL) | |
| Williams et al. (2011) +1 other reference |
Russia | |
| Ponomarev et al. (2026) |
USA (TL) | |
| Williams et al. (2011) +2 other references |
| Collected by and in the collection of ... | |
| Kampf et al. (2012) |
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Blue Bell Mine, Zzyzx, Soda Mountains, Silver Lake Mining District, San Bernardino County, California, USA