Pauladamsite
A valid IMA mineral species
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About Pauladamsite
Paul M. Adams
Formula:
Cu4(SeO3)(SO4)(OH)4 · 2H2O
Colour:
green
Lustre:
Vitreous, Silky
Hardness:
2
Specific Gravity:
3.535 (Calculated)
Crystal System:
Triclinic
Name:
Named in honor of Paul M. Adams (b. 1954) who discovered/collected the mineral. Mr. Adams has a B.S. in geology from the State University of New York at Albany (1976) and an M.S. in geology from the University of Southern California (1979). He has been employed as a spectroscopist and microscopist in the aerospace industry for 36 years and has been field collecting minerals for over 40 years. He authored/coauthored the description of more than a dozen new minerals and the structure of several more.
New structure type. Chemically somewhat similar to munakataite.
Crystal structure details: (1) four different CuO6 octahedra, edge-sharing to form 5-octahedra-wide bands along [100]; (2) SO4 tetrahedra; (3) SeO3 pyramids. The neighbouring bands are connected along [011] by bridging sulfate groups, and along [011] by bridging selenate groups.
Crystal structure details: (1) four different CuO6 octahedra, edge-sharing to form 5-octahedra-wide bands along [100]; (2) SO4 tetrahedra; (3) SeO3 pyramids. The neighbouring bands are connected along [011] by bridging sulfate groups, and along [011] by bridging selenate groups.
Unique Identifiers
Mindat ID:
46621
Long-form identifier:
mindat:1:1:46621:1
GUID
(UUID V4):
(UUID V4):
f3202572-f862-447a-8ac3-a523d5b1c9ce
IMA Classification of Pauladamsite
Classification of Pauladamsite
7.DC.40
7 : SULFATES (selenates, tellurates, chromates, molybdates, wolframates)
D : Sulfates (selenates, etc.) with additional anions, with H2O
C : With only medium-sized cations; chains of edge-sharing octahedra
7 : SULFATES (selenates, tellurates, chromates, molybdates, wolframates)
D : Sulfates (selenates, etc.) with additional anions, with H2O
C : With only medium-sized cations; chains of edge-sharing octahedra
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 |
|---|---|---|
| Pad | IMA–CNMNC | Warr, L.N. (2021). IMA–CNMNC approved mineral symbols. Mineralogical Magazine, 85(3), 291-320. doi:10.1180/mgm.2021.43 |
Physical Properties of Pauladamsite
Vitreous, Silky
Transparency:
Transparent
Colour:
green
Streak:
pale green
Hardness:
2 on Mohs scale
Tenacity:
Brittle
Cleavage:
Perfect
{001}
{001}
Fracture:
Irregular/Uneven
Density:
3.535 g/cm3 (Calculated)
Optical Data of Pauladamsite
Type:
Biaxial (-)
RI values:
nα = 1.667 nβ = 1.723(2) nγ = 1.743(2)
2V:
Measured: 60° (2)
Max Birefringence:
δ = 0.076
Image shows birefringence interference colour range (at 30µm thickness)
and does not take into account mineral colouration.
and does not take into account mineral colouration.
Surface Relief:
High
Dispersion:
strong r > v
Pleochroism:
Visible
Comments:
X light yellowish green, Y bluish green, Z nearly colorless
Chemistry of Pauladamsite
Mindat Formula:
Cu4(SeO3)(SO4)(OH)4 · 2H2O
Common Impurities:
Zn
Crystallography of Pauladamsite
Crystal System:
Triclinic
Class (H-M):
1 - Pinacoidal
Space Group:
P1
Setting:
P1
Cell Parameters:
a = 6.0742(7) Å, b = 8.415(1) Å, c = 10.780(1) Å
α = 103.665(7)°, β = 95.224(7)°, γ = 90.004(6)°
α = 103.665(7)°, β = 95.224(7)°, γ = 90.004(6)°
Ratio:
a:b:c = 0.722 : 1 : 1.281
Unit Cell V:
533.06 ų (Calculated from Unit Cell)
Z:
2
X-Ray Powder Diffraction
Powder Diffraction Data:
| d-spacing | Intensity |
|---|---|
| 10.5 Å | (100) |
| 5.81 Å | (50) |
| 3.994 Å | (67) |
| 3.431 Å | (23) |
| 2.692 Å | (57) |
| 2.485 Å | (39) |
| 2.396 Å | (32) |
| 1.513 Å | (20) |
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] | |
| 47d : [Arsenates, antimonates, selenates, bismuthinates] |
Type Occurrence of Pauladamsite
General Appearance of Type Material:
The blades are elongate on [100] and flattened on {001}, and are up to 0.5 mm long in radial sprays.
Place of Conservation of Type Material:
Co-type material is deposited in the collections of the Natural History Museum of Los Angeles County, 900 Exposition Boulevard, Los Angeles, CA 90007, USA, catalogue numbers 65569, 65570, 65571, 65572 and 65573
Geological Setting of Type Material:
Oxidized lead calc-silicate skarn; limonitic gossan
Associated Minerals at Type Locality:
Synonyms of Pauladamsite
Related Minerals - Strunz-mindat Grouping
| 7.DC.05 | Aluminite | Al2(SO4)(OH)4 · 7H2O |
| 7.DC.05 | Meta-aluminite | Al2(SO4)(OH)4 · 5H2O |
| 7.DC.10 | Butlerite | Fe3+(SO4)(OH) · 2H2O |
| 7.DC.10 | Parabutlerite | Fe3+(SO4)(OH) · 2H2O |
| 7.DC.15 | Fibroferrite | Fe3+(SO4)(OH) · 5H2O |
| 7.DC.20 | Xitieshanite | Fe3+(SO4)Cl · 6H2O |
| 7.DC.25 | Botryogen | MgFe3+(SO4)2(OH) · 7H2O |
| 7.DC.25 | Zincobotryogen | (Zn,Mg,Mn2+)Fe3+(SO4)2(OH) · 7H2O |
| 7.DC.30 | Chaidamuite | ZnFe3+(SO4)2(OH) · 4H2O |
| 7.DC.30 | Guildite | CuFe3+(SO4)2(OH) · 4H2O |
| 7.DC.45 | Riotintoite | Al(SO4)(OH) · 3H2O |
| 7.DC.50 | Thorneite | Pb6(Te6+2O10)(CO3)Cl2(H2O) |
| 7.DC.55 | Vendidaite | Al2(SO4)(OH)3Cl · 6H2O |
Fluorescence of Pauladamsite
none
Other Information
Notes:
rapidly soluble in room-temperature, dilute 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 Pauladamsite
mindat.org URL:
https://www.mindat.org/min-46621.html
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References for Pauladamsite
Reference List:
Localities for Pauladamsite
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.
USA (TL) | |
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Santa Rosa Mine, Malpais Mesa, Inyo Mts, Inyo County, California, USA