mineral
Molybdenite in Quartz
Molybdenite (MoS2) with Quartz (SiO2)
AI-generated identification · may be incorrectColor: Lead-gray to bluish-gray; Luster: Metallic; Hardness: 1-1.5 (very soft, marks paper); Crystal Structure: Hexagonal; Cleavage: Perfect basal; Streak: Greenish-gray.
- Hardness
- 1-1
- Color
- Lead-gray to bluish-gray
- Luster
- Metallic
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Physical properties
Color: Lead-gray to bluish-gray; Luster: Metallic; Hardness: 1-1.5 (very soft, marks paper); Crystal Structure: Hexagonal; Cleavage: Perfect basal; Streak: Greenish-gray.
Formation & geological history
Formed in high-temperature hydrothermal vein deposits, pegmatites, and contact metamorphic deposits. It is often found associated with quartz, fluorite, and wolframite.
Uses & applications
Molybdenite is the primary ore of molybdenum, which is used to make high-strength steel alloys, lubricants, and catalysts in the petroleum industry.
Geological facts
Molybdenite is so soft and greasy that it was historically confused with graphite. It is a semiconductor and its disulfide structure allows it to function as a dry lubricant similar to graphite.
Field identification & locations
Identify by its metallic lead-gray color, extreme softness (can be scratched by a fingernail), and the greasy feel. It often leaves a bluish or greenish streak on porcelain. Look for it in granitic areas.
