From Surf Wiki (app.surf) — the open knowledge base

Stibarsen

Native element mineral

Field	Value
name	Stibarsen
category	Arsenic minerals
image	Stibarsen-202015.jpg
caption	Size: 4.7 × 3.3 × 3.3 cm
formula	AsSb
IMAsymbol	Sbr
system	Trigonal
class	Hexagonal scalenohedral (m)
H-M symbol: ( 2/m)
symmetry	Rm (No. 166)
Pearson symbol: hR6
unit cell	a = 4.045, c = 10.961 [Å], Z = 6
color	White, gray, grayish white, reddish white
habit	Reniform ("kidney like")
cleavage	Perfect
mohs	3–4
luster	Metallic
streak	grayish-black
gravity	5.8–6.2 (meas.); 6.37 (calc.)
diaphaneity	Opaque
other	Non-fluorescent, nonmagnetic
references

H-M symbol: ( 2/m) Pearson symbol: hR6

Stibarsen or allemontite is a natural form of arsenic antimonide (AsSb) or antimony arsenide (SbAs). The name stibarsen is derived from Latin stibium (antimony) and arsenic, whereas allemontite refers to the locality Allemont in France where the mineral was discovered. It is found in veins at Allemont, Isère, France; Valtellina, Italy; and the Comstock Lode, United States; and in a lithium pegmatites at Varuträsk, Sweden. Stibarsen is often mixed with pure arsenic or antimony, and the original description in 1941 proposed to use stibarsen for AsSb and allemontite for the mixtures. Since 1982, the International Mineralogical Association considers stibarsen as the correct mineral name.

Structure

Stibarsen has the same crystal structure as arsenic and antimony, with the intermediate values of the lattice parameters. This structure (space group Rm No. 166) is variably described as hexagonal, trigonal and rhombohedral because of the overlap between these terms (see trigonal crystal system). Simulation of the X-ray diffraction intensities reveals that the Sb and As atoms form ordered (or partly ordered) sublattices in SbAs. The atoms are arranged in warped graphite-like sheets, which extend normal to the c axis. Weak bonding between the sheets accounts for the relatively low hardness of As, Sb and AsSb.

Mineral	a (nm)	c (nm)	ρ (g/cm3)
As	0.376	1.055	5.78
AsSb	0.4025	1.084	6.37
Sb	0.43056	1.125	6.72

References

Warr, L.N.. (2021). "IMA–CNMNC approved mineral symbols". Mineralogical Magazine.
[http://webmineral.com/data/Stibarsen.shtml Stibarsen]. Webmineral
[http://www.mindat.org/min-3775.html Stibarsen]. Mindat.org
[http://rruff.geo.arizona.edu/doclib/hom/stibarsen.pdf Stibarsen]. Handbook of mineralogy
[http://www.mindat.org/min-132.html Allemontite]. Mindat.org
[http://www.britannica.com/EBchecked/topic/16152/allemontite allemontite]. Encyclopædia Britannica on-line
[[Michael Fleischer (mineralogist). Michael Fleischer]] "New mineral names" ''American Mineralogist'' 26 (1941) 456
(1987). "Pressure-Induced Rhombohedral-Simple Cubic Structural Phase Transition in As". Journal of the Physical Society of Japan.
Peter Bayliss [http://www.minsocam.org/ammin/AM76/AM76_257.pdf Crystal chemistry and crystallography of some minerals in the tetradymite group] American Mineralogist, 76 (1991) 257–265
(1997). "Solid state phase equilibria in the Pt–Sb–Te system". Journal of Alloys and Compounds.

Info: Wikipedia Source

This article was imported from Wikipedia and is available under the Creative Commons Attribution-ShareAlike 4.0 License. Content has been adapted to SurfDoc format. Original contributors can be found on the article history page.

arsenic-minerals trigonal-minerals minerals-in-space-group-166 native-element-minerals antimonide-minerals minerals-described-in-1941

Want to explore this topic further?

Ask Mako anything about Stibarsen — get instant answers, deeper analysis, and related topics.

Research with Mako

Free with your Surf account

Content sourced from Wikipedia, available under CC BY-SA 4.0.

This content may have been generated or modified by AI. CloudSurf Software LLC is not responsible for the accuracy, completeness, or reliability of AI-generated content. Always verify important information from primary sources.

Report