Freieslebenite
| Freieslebenite | |
|---|---|
Freieslebenite from Hiendelaencina, Spain. Exposed in the Mineralogical Museum, Bonn, Germany | |
| General | |
| Category | Sulfosalt minerals |
| Formula | AgPbSbS3 |
| IMA symbol | Flb |
| Strunz classification | 2.JB.15 |
| Crystal system | Monoclinic |
| Crystal class | Prismatic (2/m) (same H-M symbol) |
| Space group | P21/n |
| Unit cell | a = 7.518(1) b = 12.809(4) c = 5.940(1) [Å] β = 92.25(1)°; Z = 4 |
| Identification | |
| Color | Pale steel-gray to silver-white or lead-gray |
| Crystal habit | Striated, prismatic crystals, inclusions and exsolutions in galena and other silver minerals |
| Twinning | Twin plane {010} |
| Cleavage | {110} Indistinct |
| Fracture | Brittle-conchoidal |
| Mohs scale hardness | 2.5 |
| Luster | Metallic |
| Streak | Whitish-gray |
| Diaphaneity | Opaque |
| Specific gravity | 6.20–6.23 |
| Pleochroism | Very weak |
| References | |
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Freieslebenite is a sulfosalt mineral composed of antimony, lead, and silver. Sulfosalt minerals are complex sulfide minerals with the formula: AmBnSp. The formula of freieslebenite is AgPbSbS3.
Freieslebenite was discovered in approximately 1773 in the Himmelsfurst mines of Freiberg, Saxony, Germany. The mineral was initially called Schilf-Glaserz; however, in 1845 it was given the current name Freieslebenite after the Mining Commissioner of Saxony, Johann Carl Freiesleben (1774–1846).