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Pauladamsite

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About PauladamsiteHide

Formula:
Cu4(SeO3)(SO4)(OH)4·2H2O
Colour:
green
Lustre:
Vitreous, Silky
Hardness:
2
Specific Gravity:
3.535 (Calculated)
Crystal System:
Triclinic
Name:
For 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.
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.


Classification of PauladamsiteHide

Approved
Approval Year:
2015
First Published:
2015

Physical Properties of PauladamsiteHide

Vitreous, Silky
Transparency:
Transparent
Colour:
green
Streak:
pale green
Hardness:
Tenacity:
Brittle
Cleavage:
Perfect
{001}
Fracture:
Irregular/Uneven
Density:
3.535 g/cm3 (Calculated)

Optical Data of PauladamsiteHide

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.
Surface Relief:
High
Dispersion:
strong r > v
Pleochroism:
Visible
Comments:
X light yellowish green, Y bluish green, Z nearly colorless

Chemical Properties of PauladamsiteHide

Formula:
Cu4(SeO3)(SO4)(OH)4·2H2O
IMA Formula:
Cu4(SeO3)(SO4)(OH)4 · 2H2O
Common Impurities:
Zn

Crystallography of PauladamsiteHide

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)°
Ratio:
a:b:c = 0.722 : 1 : 1.281
Unit Cell V:
533.06 ų (Calculated from Unit Cell)
Z:
2

X-Ray Powder DiffractionHide

Powder Diffraction Data:
d-spacingIntensity
10.5(100)
5.81(50)
3.994(67)
3.431(23)
2.692(57)
2.485(39)
2.396(32)
1.513(20)

Type Occurrence of PauladamsiteHide

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 PauladamsiteHide

Fluorescence of PauladamsiteHide

Other InformationHide

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.

References for PauladamsiteHide

Reference List:
Sort by Year (asc) | by Year (desc) | by Author (A-Z) | by Author (Z-A)
Kampf, A.R., Mills, S.J. and Nash, B.P. (2015) Pauladamsite, IMA 2015-005. CNMNC Newsletter No. 25, June 2015, page 532; Mineralogical Magazine, 79, 529-535.
Kampf, A.R., Mills, S.J., Nash, B.P. (2016): Pauladamsite, Cu4(SeO3)(SO4)(OH)4·2H2O, a new mineral from the Santa Rosa mine, Darwin district, California, USA. Mineralogical Magazine, 80: 949-958.

Internet Links for PauladamsiteHide

Localities for PauladamsiteHide

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 (TL)
 
  • California
    • Inyo Co.
      • Inyo Mts (Inyo Range)
        • Malpais Mesa
Kampf, A.R., Mills, S.J., Nash, B.P. (2016): Pauladamsite, Cu4(SeO3)(SO4)(OH)4·2H2O, a new mineral from the Santa Rosa mine, Darwin district, California, USA. Mineralogical Magazine, 80: 949-958.; Paul M. Adams (2017) The Santa Rosa mine, Inyo County, California. Minerlogical Record 48:755-777
Mineral and/or Locality  
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