Feinglosite
A valid IMA mineral species
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About Feinglosite
Mark Feinglos
Formula:
Pb2Zn(AsO4)2 · H2O
May contain minor Fe replacing Zn.
Colour:
Pale olive green
Lustre:
Adamantine
Hardness:
4 - 5
Specific Gravity:
6.52 (Calculated)
Crystal System:
Monoclinic
Member of:
Name:
Named after Mark Neil Feinglos (23 February 1948, Syracuse, New York, USA - 14 March 2020, Durham, North Carolina, USA), Professor at the Duke University Medical Center, Durham, North Carolina, U.S.A., who discovered the mineral. He assembled an important collection, including many type minerals. He was awarded the William Pinch Medal in 2003. (Please note Am. Min. incorrectly reported middle initial as D)
This page provides mineralogical data about Feinglosite.
Unique Identifiers
Mindat ID:
6923
Long-form identifier:
mindat:1:1:6923:2
IMA Classification of Feinglosite
Approved
IMA Formula:
Pb2+2Zn2+(As5+O4)2·H2O
Approval year:
1995
First published:
1997
Classification of Feinglosite
8.BG.05
8 : PHOSPHATES, ARSENATES, VANADATES
B : Phosphates, etc., with additional anions, without H2O
G : With medium-sized and large cations, (OH, etc.):RO4 = 0.5:1
8 : PHOSPHATES, ARSENATES, VANADATES
B : Phosphates, etc., with additional anions, without H2O
G : With medium-sized and large cations, (OH, etc.):RO4 = 0.5:1
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 |
|---|---|---|
| Fgl | 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 Feinglosite
Pronunciation:
| Play | Recorded by | Country |
|---|---|---|
| Jolyon & Katya Ralph | United Kingdom |
Physical Properties of Feinglosite
Adamantine
Transparency:
Translucent
Colour:
Pale olive green
Streak:
White
Hardness:
4 - 5 on Mohs scale
Hardness:
VHN100=253 - 285 - Vickers
Tenacity:
Sectile
Density:
6.52 g/cm3 (Calculated)
Comment:
Could not be measured (Could not be separated from the goethite)
Optical Data of Feinglosite
Anisotropism:
Not noticable anisotropic
Bireflectance:
very weak, but measurable
Reflectivity:
| Wavelength | R1 (%) | R2 (%) |
|---|---|---|
| 400nm | 12.2% | 12.3% |
| 420nm | 11.8% | 12.0% |
| 440nm | 11.6% | 11.8% |
| 460nm | 11.4% | 11.6% |
| 480nm | 11.2% | 11.4% |
| 500nm | 11.1% | 11.2% |
| 520nm | 10.9% | 11.1% |
| 540nm | 10.8% | 11.0% |
| 560nm | 10.8% | 10.9% |
| 580nm | 10.7% | 10.8% |
| 600nm | 10.7% | 10.8% |
| 620nm | 10.7% | 10.8% |
| 640nm | 10.7% | 10.8% |
| 660nm | 10.7% | 10.8% |
| 680nm | 10.7% | 10.8% |
| 700nm | 10.6% | 10.7% |
Graph shows reflectance levels at different wavelengths (in nm). Peak reflectance is 12.3%.
R1 shown in black, R2 shown in red
Colour in reflected light:
Pale brownish grey
Internal Reflections:
Abundant, colourless (may be colored pale yellowish by included goethite)
Pleochroism:
Non-pleochroic
Chemistry of Feinglosite
Mindat Formula:
Pb2Zn(AsO4)2 · H2O
May contain minor Fe replacing Zn.
May contain minor Fe replacing Zn.
Element Weights:
Crystallography of Feinglosite
Crystal System:
Monoclinic
Class (H-M):
2/m - Prismatic
Cell Parameters:
a = 8.973(6) Å, b = 5.955(3) Å, c = 7.766(6) Å
β = 112.20(6)°
β = 112.20(6)°
Ratio:
a:b:c = 1.507 : 1 : 1.304
Unit Cell V:
384.21 ų (Calculated from Unit Cell)
Z:
2
Morphology:
Radiating globular masses.
Comment:
Space group P21/m or P21.
X-Ray Powder Diffraction
Powder Diffraction Data:
| d-spacing | Intensity |
|---|---|
| 3.246 Å | (100) |
| 2.988 Å | (60) |
| 2.769 Å | (60) |
| 4.85 Å | (50) |
| 2.107 Å | (50) |
| 3.659 Å | (30) |
| 2.293 Å | (30) |
Geological Environment
Paragenetic Mode(s):
| Paragenetic Mode | Earliest Age (Ga) |
|---|---|
| Stage 7: Great Oxidation Event | <2.4 |
| 47a : [Near-surface hydration of prior minerals] | |
| 47b : [Sulfates and sulfites] | |
| 47c : [Carbonates, phosphates, borates, nitrates] | |
| 47d : [Arsenates, antimonates, selenates, bismuthinates] |
Type Occurrence of Feinglosite
General Appearance of Type Material:
Radiating globular masses with a goethite core, found in a cavity (about 2cm) in chalcocite
Place of Conservation of Type Material:
The Natural History Museum, London, England, 1984,943.
Harvard University, Cambridge, Massachusetts, USA, 95.66.
Harvard University, Cambridge, Massachusetts, USA, 95.66.
Associated Minerals at Type Locality:
Synonyms of Feinglosite
Other Language Names for Feinglosite
Relationship of Feinglosite to other Species
Member of:
Other Members of Brackebuschite Supergroup:
| Aldomarinoite | Sr2Mn3+(AsO4)2(OH) | Mon. 2/m : P21/m |
| Arsenbrackebuschite | Pb2Fe3+(AsO4)2(OH) | Mon. 2/m : P2/m |
| Arsentsumebite | Pb2Cu(AsO4)(SO4)(OH) | Mon. 2/m : P21/m |
| Bearthite | Ca2Al(PO4)2(OH) | Mon. 2/m : P21/m |
| Brackebuschite | Pb2Mn3+(VO4)2(OH) | Mon. 2/m : P21/m |
| Bushmakinite | Pb2Al(PO4)(VO4)(OH) | Mon. 2/m : P21/m |
| Calderónite | Pb2Fe3+(VO4)2(OH) | Mon. 2/m : P21/m |
| Canosioite | Ba2Fe3+(AsO4)2(OH) | Mon. 2/m : P21/m |
| Ferribushmakinite | Pb2Fe3+(PO4)(VO4)(OH) | Mon. 2/m : P21/m |
| Gamagarite | Ba2Fe3+(VO4)2(OH) | Mon. 2/m : P21/m |
| Goedkenite | Sr2Al(PO4)2(OH) | Mon. 2/m : P21/m |
| Grandaite | Sr2Al(AsO4)2(OH) | Mon. 2/m : P21/m |
| Lombardoite | Ba2Mn3+(AsO4)2(OH) | Mon. 2/m : P21/m |
| Tokyoite | Ba2Mn3+(VO4)2(OH) | Mon. 2/m : P21/m |
| Tsumebite | Pb2Cu(PO4)(SO4)(OH) | Mon. 2/m : P21/m |
| 'Unnamed (possible ordered As-analogue of Tokyoite)' | Ba2Mn[(As,V)O4]2(OH) | Mon. 2/m : P21/m |
Common Associates
Associations Based on Photo Data:
| 10 photos of Feinglosite associated with Mimetite | Pb5(AsO4)3Cl |
| 4 photos of Feinglosite associated with Native Copper | Cu |
| 4 photos of Feinglosite associated with Calcite | CaCO3 |
| 3 photos of Feinglosite associated with Adamite | Zn2(AsO4)(OH) |
| 3 photos of Feinglosite associated with Pyromorphite | Pb5(PO4)3Cl |
| 2 photos of Feinglosite associated with Goethite | Fe3+O(OH) |
| 2 photos of Feinglosite associated with Galena | PbS |
| 1 photo of Feinglosite associated with Hydroxylpyromorphite | Pb5(PO4)3(OH) |
| 1 photo of Feinglosite associated with Senarmontite | Sb2O3 |
| 1 photo of Feinglosite associated with Anglesite | PbSO4 |
Related Minerals - Strunz-mindat Grouping
| 8.BG. | Aldomarinoite | Sr2Mn3+(AsO4)2(OH) |
| 8.BG. | Dongchuanite | Pb4ZnZn2(PO4)4(OH)2 |
| 8.BG. | Cuprodongchuanite | Pb4CuZn2(PO4)4(OH)2 |
| 8.BG. | Canosioite | Ba2Fe3+(AsO4)2(OH) |
| 8.BG.05 | Tokyoite | Ba2Mn3+(VO4)2(OH) |
| 8.BG.05 | Lombardoite | Ba2Mn3+(AsO4)2(OH) |
| 8.BG.05 | Bearthite | Ca2Al(PO4)2(OH) |
| 8.BG.05 | 'Unnamed (possible ordered As-analogue of Tokyoite)' | Ba2Mn[(As,V)O4]2(OH) |
| 8.BG.05 | Gamagarite | Ba2Fe3+(VO4)2(OH) |
| 8.BG.05 | Arsentsumebite | Pb2Cu(AsO4)(SO4)(OH) |
| 8.BG.05 | 'UM1994-19-PO:CuHMoPb' | Pb2Cu(PO4)(MoO4,AsO4,CrO4,GaO4)(OH) |
| 8.BG.05 | Ferribushmakinite | Pb2Fe3+(PO4)(VO4)(OH) |
| 8.BG.05 | Arsenbrackebuschite | Pb2Fe3+(AsO4)2(OH) |
| 8.BG.05 | Goedkenite | Sr2Al(PO4)2(OH) |
| 8.BG.05 | Tsumebite | Pb2Cu(PO4)(SO4)(OH) |
| 8.BG.05 | Brackebuschite | Pb2Mn3+(VO4)2(OH) |
| 8.BG.05 | Bushmakinite | Pb2Al(PO4)(VO4)(OH) |
| 8.BG.05 | Calderónite | Pb2Fe3+(VO4)2(OH) |
| 8.BG.10 | Mélonjosephite | CaFe2+Fe3+(PO4)2(OH) |
| 8.BG.15 | Tancoite | LiNa2Al(PO4)(PO3OH)(OH) |
| 8.BG.20 | Dmisokolovite | K3Cu5AlO2(AsO4)4 |
| 8.BG.25 | Shchurovskyite | K2CaCu6O2(AsO4)4 |
| 8.BG.30 | Wrightite | K2Al2O(AsO4)2 |
| 8.BG.35 | Polyarsite | Na7CaMgCu2(AsO4)4F2Cl |
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.
Internet Links for Feinglosite
mindat.org URL:
https://www.mindat.org/min-6923.html
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References for Feinglosite
Reference List:
Clark, A. M., Criddle, A. J., Roberts, A. C., Bonardi, M., Moffatt, E. A. (1997) Feinglosite, a new mineral related to brackebuschite, from Tsumeb, Namibia. Mineralogical Magazine, 61 (405) 285-289 doi:10.1180/minmag.1997.061.405.11
Localities for Feinglosite
Showing 3 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.
Greece | |
| Rieck et al. (1999) |
| Rieck (1999) +1 other reference |
Namibia (TL) | |
| Clark et al. (1997) |
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Tsumeb Mine, Tsumeb, Oshikoto Region, Namibia