Pararsenolamprite
A valid IMA mineral species
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About Pararsenolamprite
Formula:
(As,Sb)
Type material has the formula As0.94Sb0.05S0.01.
Colour:
grey
Lustre:
Metallic
Hardness:
2 - 2½
Specific Gravity:
5.88
Crystal System:
Orthorhombic
Name:
Named for the Greek παρά ("para"), "similar", and arsenolamprite, for the polymorphic relationship between the two species.
Polymorph of:
Sb-bearing polymorph of native arsenic and arsenolamprite. Unlike normal native arsenic, stable in the atmosphere. Found with stibnite on mammillary arsenic in quartz vein from a hydrothermal Ag-Au mine.
Unique Identifiers
Mindat ID:
10994
Long-form identifier:
mindat:1:1:10994:5
GUID
(UUID V4):
(UUID V4):
321bf173-598a-4c72-990f-0a356258ceca
IMA Classification of Pararsenolamprite
Classification of Pararsenolamprite
1.CA.10
1 : ELEMENTS (Metals and intermetallic alloys; metalloids and nonmetals; carbides, silicides, nitrides, phosphides)
C : Metalloids and Nonmetals
A : Arsenic group elements
1 : ELEMENTS (Metals and intermetallic alloys; metalloids and nonmetals; carbides, silicides, nitrides, phosphides)
C : Metalloids and Nonmetals
A : Arsenic group elements
Dana 7th ed.:
1.3.1.6
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 |
---|---|---|
Pasl | 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 Pararsenolamprite
Metallic
Transparency:
Opaque
Colour:
grey
Streak:
black
Hardness:
2 - 2½ on Mohs scale
Hardness:
VHN25=66 - 91 kg/mm2 - Vickers
Tenacity:
Brittle
Cleavage:
Perfect
{001}
{001}
Density:
5.88 g/cm3 (Measured) 5.99 g/cm3 (Calculated)
Optical Data of Pararsenolamprite
Anisotropism:
Strong (dark brown, greenish grey)
Bireflectance:
Distinct (cream parallel to elongation and brown, green perpendicular to elongation)
Reflectivity:
Wavelength | R1 | R2 | imR1 | imR2 |
---|---|---|---|---|
470nm | 49.0% | 44.0% | 33.6% | 29.3% |
546nm | 47.0% | 42.1% | 31.5% | 28.0% |
589nm | 44.8% | 39.9% | 29.7% | 26.9% |
650nm | 44.9% | 40.3% | 29.2% | 26.0% |
Graph shows reflectance levels at different wavelengths (in nm). Top of box is 100%. Peak reflectance is 49.0%.
R1 shown in black, R2 shown in red, imR1 shown in green, imR2 shown in blue
Colour in reflected light:
White with a slightly greenish-blue tint
Chemistry of Pararsenolamprite
Mindat Formula:
(As,Sb)
Type material has the formula As0.94Sb0.05S0.01.
Type material has the formula As0.94Sb0.05S0.01.
Elements listed:
Common Impurities:
Sb,S
Crystallography of Pararsenolamprite
Crystal System:
Orthorhombic
Class (H-M):
mm2 - Pyramidal
Space Group:
Pmn21
Cell Parameters:
a = 3.663 Å, b = 10.196 Å, c = 10.314 Å
Ratio:
a:b:c = 0.359 : 1 : 1.012
Unit Cell V:
382.1 ų
Z:
18
Morphology:
{001}, elongated on [100] and flattened on {001}
Twinning:
None mentioned
X-Ray Powder Diffraction
Powder Diffraction Data:
d-spacing | Intensity |
---|---|
5.17 Å | (100) |
4.60 Å | (24) |
3.259 Å | (58) |
2.840 Å | (27) |
2.580 Å | (22) |
2.299 Å | (23) |
1.794 Å | (26) |
Geological Environment
Paragenetic Mode(s):
Paragenetic Mode | Earliest Age (Ga) |
---|---|
High-𝑇 alteration and/or metamorphism | |
33 : Minerals deposited by hydrothermal metal-rich fluids (see also [#12]) | |
Stage 7: Great Oxidation Event | <2.4 |
47h : [Near-surface oxidized, dehydrated minerals] |
Type Occurrence of Pararsenolamprite
Geological Setting of Type Material:
In a hydrothermal Sb-As-Ag-Au ore deposit.
Associated Minerals at Type Locality:
Synonyms of Pararsenolamprite
Other Language Names for Pararsenolamprite
Common Associates
Related Minerals - Strunz-mindat Grouping
1.CA.05 | Antimony | Sb |
1.CA.05 | Arsenic | As |
1.CA.05 | Bismuth | Bi |
1.CA.05 | Stibarsen | AsSb |
1.CA.10 | Arsenolamprite | As |
1.CA.15 | Paradocrasite | Sb2(Sb,As)2 |
1.CA.20 | Phosphorus | P4 |
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 Pararsenolamprite
mindat.org URL:
https://www.mindat.org/min-10994.html
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Please feel free to link to this page.
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External Links:
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References for Pararsenolamprite
Localities for Pararsenolamprite
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).
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 (e.g. from pseudomorphs).
All localities listed without proper references should be considered as questionable.
All localities listed without proper references should be considered as questionable.
Chile | |
| XRD by Igor V. Pekov |
Japan (TL) | |
| Mineralogical Magazine (2001) |
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Hinoji Mine, Yamaga, Hayami District, Oita Prefecture, Japan