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Pararsenolamprite

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About PararsenolampriteHide

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.
Sb-bearing polymorph of native arsenic. Unlike normal native arsenic, stable in the atmosphere. Found with stibnite on mammillary arsenic in quartz vein from a hydrothermal Ag-Au mine.

Compare arsenolamprite.


Classification of PararsenolampriteHide

Approved
Approval Year:
1999
1.CA.10

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

Physical Properties of PararsenolampriteHide

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}
Density:
5.88 g/cm3 (Measured)    5.99 g/cm3 (Calculated)

Optical Data of PararsenolampriteHide

Type:
Anisotropic
Anisotropism:
Strong (dark brown, greenish grey)
Bireflectance:
Distinct (cream parallel to elongation and brown, green perpendicular to elongation)
Reflectivity:
470nmR1=49.0%R2= 44.0%imR1= 33.6%imR2= 29.3%
546nmR1=47.0%R2= 42.1%imR1= 31.5%imR2= 28.0%
589nmR1=44.8%R2= 39.9%imR1= 29.7%imR2= 26.9%
650nmR1=44.9%R2= 40.3%imR1= 29.2%imR2= 26.0%

Reflectance graph
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

Chemical Properties of PararsenolampriteHide

Formula:
(As,Sb)

Type material has the formula As0.94Sb0.05S0.01.
IMA Formula:
As
Common Impurities:
Sb,S

Crystallography of PararsenolampriteHide

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 DiffractionHide

Powder Diffraction Data:
d-spacingIntensity
5.17 (100)
4.60 (24)
3.259 (58)
2.840 (27)
2.580 (22)
2.299 (23)
1.794 (26)

Type Occurrence of PararsenolampriteHide

Geological Setting of Type Material:
In a hydrothermal Sb-As-Ag-Au ore deposit.
Associated Minerals at Type Locality:

Synonyms of PararsenolampriteHide

Other Language Names for PararsenolampriteHide

Simplified Chinese:副斜方砷

Common AssociatesHide

Associated Minerals Based on Photo Data:
Arsenic1 photo of Pararsenolamprite associated with Arsenic on mindat.org.

Related Minerals - Nickel-Strunz GroupingHide

1.CA.05AntimonySbTrig. 3m (3 2/m) : R3m
1.CA.05ArsenicAsTrig. 3m (3 2/m) : R3m
1.CA.05BismuthBiTrig. 3m (3 2/m) : R3m
1.CA.05StibarsenAsSbTrig. 3m (3 2/m) : R3m
1.CA.10ArsenolampriteAsOrth. mmm (2/m 2/m 2/m)
1.CA.15ParadocrasiteSb3AsMon. 2 : B2

Other InformationHide

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 PararsenolampriteHide

Reference List:
Sort by Year (asc) | by Year (desc) | by Author (A-Z) | by Author (Z-A)
Matsubara, S.; Miyawaki, R.; Shimizu, M.; Yamanaka, T. (2001): Pararsenolamprite, a new polymorph of native As, from the Mukuno mine, Oita Prefecture, Japan. Mineralogical Magazine: 65: 807-812.

Internet Links for PararsenolampriteHide

Localities for PararsenolampriteHide

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.
Chile
 
  • Tarapacá
    • Iquique Province
      • Salar Grande
XRD by Igor V. Pekov, SEM-EDS by Joy Desor
Japan (TL)
 
  • Oita
    • Hayami-gun
      • Yamaga
Mineralogical Magazine(2001) 65, 807-812
Mineral and/or Locality  
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