Mineral Factbook

Pararealgar

As4S4IMA symbol: Prlgapproved

Pararealgar is a sulfide or sulfosalt mineral with the formula As4S4, crystallizing in the monoclinic system. It has a calculated density of 3.523 g/cm3.

Photos

Pararealgar specimen photo
Kaarel Tiidus · CC BY-SA 4.0 · Commons
Pararealgar specimen photo
Kaarel Tiidus · CC BY-SA 4.0 · Commons
Pararealgar specimen photo
Jynto (talk) · CC0 · Commons
Pararealgar specimen photo
Jynto (talk) · CC0 · Commons

Crystallography

Crystal systemmonoclinic crystal systemWikidata (CC0)
Space groupP 1 21/c 1
Cell (Å, °)a = 9.909, b = 9.655, c = 8.502; α = 90, β = 97.29, γ = 90
Cell volume806.823 ų, Z = 16
Axial ratios1.0263:1:0.8806calculated from COD 9001678
Source structureCOD 9001678 (American Mineralogist, 1995) — 1 of 3 structures

Powder X-ray diffraction (calculated)

2θ (degrees, Cu Kα1)I/I₀ (max 100)
d (Å)5.1163.2925.5832.7923.7482.03
I/I₀10082.77875.46041.7

xrd-v1: CuKa1 1.5406A, 2theta 5-90, top10, Imax=100, no DW/PO. Computed from COD 9001678; idealized occupancies, no preferred orientation.

Physical properties

Density (calculated)3.523 g/cm³calculated from COD 9001678

Chemistry (calculated)

Molecular weight427.95 g/molcalculated from the IMA formula
Composition (wt%)As 70.03%, S 29.97%

Classification

Nickel-Strunz (10th)2.FA.15bWikidata (CC0)
Nickel-Strunz (9th)2.FA.15bWikidata (CC0)
Dana (8th)2.8.21.2Wikidata (CC0)