Wulfenite and Quartz

History: Renamed in 1845 by Wilhelm Karl von Haidinger in honor of Franz Xavier von Wulfen.

Tests: Fuses readily, produces a yellow flame and virtually invisible in water.

Uses: A secondary ore of molybdenum.

Properties
Cleavage Distinct
Color Orange-yellow, yellow, honey-yellow, reddish-orange, grey, brown, black; rarely colorless
Crystal Systems Tetragonal
Fracture Sub-Conchoidal
Hardness 2.5-3
Specific Gravity 6.5-7.0

Group

Molybdates

Composition

PbMoO4