Mineral Factbook

Krennerite

Au3AgTe8IMA symbol: Knngrandfathered

Krennerite is a sulfide or sulfosalt mineral with the formula Au3AgTe8, crystallizing in the orthorhombic system. It has a Mohs hardness of 2-5, typically yellow in color, with a resinous or vitreous luster, a specific gravity of 9.043. Its streak is gray or yellow.

Photos

Krennerite specimen photo
Pacific Museum of Earth from Canada · CC BY-SA 2.0 · Commons
Krennerite specimen photo
Pacific Museum of Earth from Canada · CC BY-SA 2.0 · Commons
Krennerite specimen photo
James St. John · CC BY 2.0 · Commons
Krennerite specimen photo
James St. John · CC BY 2.0 · Commons

Crystallography

Crystal systemorthorhombic crystal systemWikidata (CC0)
Space groupP m a 2
Cell (Å, °)a = 16.59, b = 8.867, c = 4.4886; α = 90, β = 90, γ = 90
Cell volume660.289 ų, Z = 4
Axial ratios1.8710:1:0.5062calculated from COD 9016172
Source structureCOD 9016172 (The Canadian Mineralogist, 2012) — 1 of 4 structures

Powder X-ray diffraction (calculated)

2θ (degrees, Cu Kα1)I/I₀ (max 100)
d (Å)3.0462.1212.9562.0741.6982.244
I/I₀10057.540.518.615.515.4

xrd-v1: CuKa1 1.5406A, 2theta 5-90, top10, Imax=100, no DW/PO. Computed from COD 9016172; idealized occupancies, no preferred orientation.

Physical properties

Density (calculated)8.637 g/cm³calculated from COD 9016172
Hardness (Mohs)
2-5single sourceDana, System of Mineralogy, 6th ed. (1892)
Specific gravity
9.043 g/cm3corroboratedDana, System of Mineralogy, 6th ed. (1892)
Color
yellowsingle sourceDana, System of Mineralogy, 6th ed. (1892)
Streak
gray, yellowsingle sourceDana, System of Mineralogy, 6th ed. (1892)
Luster
resinous, vitreoussingle sourceDana's System, 3rd Appendix (1915)

Chemistry (calculated)

Molecular weight1719.57 g/molcalculated from the IMA formula
Composition (wt%)Au 34.36%, Ag 6.27%, Te 59.36%

Classification

Nickel-Strunz (10th)2.EA.15Wikidata (CC0)
Nickel-Strunz (9th)2.EA.15Wikidata (CC0)