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Pararsenolamprite

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Hinoji mine (Hinodji mine; Mukuno mine), Hayami-gun, Oita prefecture, Kyushu Region, Japan
© Knut Eldjarn




Formula:
(As,Sb)
System:OrthorhombicColour:grey
Lustre:MetallicHardness:2 - 2½
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. With stibnite on mammillary arsenic in quartz vein from a hydrothermal Ag-Au mine.

Classification of Pararsenolamprite

IMA status:Approved 1999
Strunz 8th edition ID:1/B.01-55
Nickel-Strunz 10th (pending) edition ID: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 edition ID:1.3.1.6
mindat.org URL:http://www.mindat.org/min-10994.html
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Type Occurrence of Pararsenolamprite

Type Locality:Hinoji mine (Hinodji mine; Mukuno mine), Hayami-gun, Oita prefecture, Kyushu Region, Japan
Geological Setting of type material:In a hydrothermal Sb-As-Ag-Au ore deposit.
Associated Minerals at type locality:
StibniteQuartzArsenic

Physical Properties of Pararsenolamprite

Lustre:Metallic
Diaphaneity (Transparency):Opaque
Colour:grey
Streak:black
Hardness (Mohs):2 - 2½
Hardness (Vickers):VHN25=66 - 91 kg/mm2
Tenacity:Brittle
Cleavage:Perfect
{001}
Density (measured):5.88 g/cm3
Density (calculated):5.99 g/cm3

Crystallography of Pararsenolamprite

Crystal System:Orthorhombic
Class (H-M):mm2 - Pyramidal
Space Group:Pmn21
Cell Parameters:a = 3.663Å, b = 10.196Å, c = 10.314Å
Ratio:a:b:c = 0.359 : 1 : 1.012
Unit Cell Volume:V 382.1 ų
Z:18
Morphology:{001}, elongated on [100] and flattened on {001}
Twinning:None mentioned
X-Ray Powder Diffraction:
d-spacingIntensity
5.17 (100)
4.60 (24)
3.259 (58)
2.840 (27)
2.580 (22)
2.299 (23)
1.794 (26)

Optical Data of Pararsenolamprite

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%


Graph shows reflectance levels at different wavelengths (in nm). 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 Pararsenolamprite

Formula:
(As,Sb)
Essential elements:As
All elements listed in formula:As, Sb
Analytical Data:Means of eight sets of electron microprobe data.
As (91.89)
Sb (7.25)
S (0.48)
Empirical Formula:
(As
 
0.94
Sb
 
0.05
S
 
0.01
)
 
Σ1.00
Common Impurities:Sb,S

Relationship of Pararsenolamprite to other Species

Related Minerals - Nickel-Strunz Grouping):

- +
1.CA.05Antimony
Sb
1.CA.05Arsenic
As
1.CA.05Bismuth
Bi
1.CA.05Stibarsen
AsSb
1.CA.10Arsenolamprite
As
1.CA.15Paradocrasite
Sb
 
3
As
Related Minerals - Dana Grouping):

- +
1.3.1.1Arsenic
As
1.3.1.2Arsenolamprite
As
1.3.1.3Stibarsen
AsSb
1.3.1.4Antimony
Sb
1.3.1.5Bismuth
Bi

Other Names for Pararsenolamprite

Synonyms:
IMA1999-047
Other Languages:
German:Pararsenolamprit
Spanish:Pararsenolamprita

Other Information

Health Warning:No information on health risks for this material has been entered into the database. You should always treat mineral specimens with care.

References for Pararsenolamprite

Reference List:

- +
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 Pararsenolamprite

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    • Localities for Pararsenolamprite

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    (TL) indicates type locality. ? indicates mineral may be doubtful at this locality. All other localities listed without reference should be considered as uncertain and unproven until references can be found.
    Japan
     
    • Kyushu Region
      • Oita prefecture
        • Hayami-gun
    		Min.Mag.(2001) 65, 807-812
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