IMPORTANT MESSAGE. We need your support now to keep mindat.org running. Click here to find out why.
Log InRegister
Home PageAbout MindatThe Mindat ManualHistory of MindatCopyright StatusWho We AreContact UsAdvertise on Mindat
Donate to MindatCorporate SponsorshipSponsor a PageSponsored PagesMindat AdvertisersAdvertise on Mindat
Learning CenterWhat is a mineral?The most common minerals on earthInformation for Educators
Minerals by PropertiesMinerals by ChemistryAdvanced Locality SearchRandom MineralRandom LocalitySearch by minIDLocalities Near MeSearch ArticlesSearch GlossaryMore Search Options
Search For:
Mineral Name:
Locality Name:
Keyword(s):
 
The Mindat ManualAdd a New PhotoRate PhotosLocality Edit ReportCoordinate Completion ReportAdd Glossary Item
StatisticsThe ElementsUsersBooks & MagazinesMineral MuseumsMineral Shows & EventsThe Mindat DirectoryDevice Settings
Photo SearchPhoto GalleriesNew Photos TodayNew Photos YesterdayMembers' Photo GalleriesPast Photo of the Day Gallery

Pararsenolamprite

This page is currently not sponsored. Click here to sponsor this page.
Hide all sections | Show all sections

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

ⓘ - 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 Region
    • Iquique Province
      • Salar Grande
XRD by Igor V. Pekov, SEM-EDS by Joy Desor
Japan (TL)
 
  • Kyushu Region
    • Oita prefecture
      • Hayami-gun
        • Yamaga
Mineralogical Magazine(2001) 65, 807-812
Mineral and/or Locality  
Mindat.org is an outreach project of the Hudson Institute of Mineralogy, a 501(c)(3) not-for-profit organization.
Copyright © mindat.org and the Hudson Institute of Mineralogy 1993-2018, except where stated. Mindat.org relies on the contributions of thousands of members and supporters.
Privacy Policy - Terms & Conditions - Contact Us Current server date and time: October 20, 2018 20:59:13 Page generated: October 17, 2018 14:42:05
Go to top of page