Rock Identifier
Pyrite on Quartz (Iron Sulfide (FeS2) on Silicon Dioxide (SiO2)) — mineral
mineral

Pyrite on Quartz

Iron Sulfide (FeS2) on Silicon Dioxide (SiO2)

Hardness: Pyrite (6-6.5), Quartz (7). Color: Brass-yellow (Pyrite), Transparent/Cloudy (Quartz). Luster: Metallic for Pyrite, Vitreous/Glassy for Quartz. Crystal Structure: Isometric (cubes) for Pyrite, Trigonal (hexagonal prisms) for Quartz. Specific Gravity: 5.0 (Pyrite), 2.65 (Quartz).

Hardness
Pyrite (6-6
Color
Brass-yellow (Pyrite), Transparent/Cloudy (Quartz)
Luster
Metallic for Pyrite, Vitreous/Glassy for Quartz
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Physical properties

Hardness: Pyrite (6-6.5), Quartz (7). Color: Brass-yellow (Pyrite), Transparent/Cloudy (Quartz). Luster: Metallic for Pyrite, Vitreous/Glassy for Quartz. Crystal Structure: Isometric (cubes) for Pyrite, Trigonal (hexagonal prisms) for Quartz. Specific Gravity: 5.0 (Pyrite), 2.65 (Quartz).

Formation & geological history

Formed in hydrothermal veins through precipitating from mineral-rich hot fluids. These common minerals can range from Precambrian to Holocene in age. They are often found in sedimentary deposits, metamorphic rocks, and igneous intrusions.

Uses & applications

Primarily used as decorative display specimens, lapidary art, and metaphysical collecting. Historically, Pyrite was used for making sulfuric acid, and Quartz is used widely in electronics and glass manufacturing.

Geological facts

Pyrite is famously known as 'Fool\'s Gold' because its metallic luster and yellow color frequently fooled prospectors. Unlike gold, Pyrite is brittle and will crush into powder. Quartz is the second most abundant mineral in Earth\'s continental crust.

Field identification & locations

Identify in the field by looking for the distinct cubic habit of the Pyrite against the hexagonal prism of the Quartz. Pyrite will leave a greenish-black streak, while Quartz is too hard to streak on a standard plate. Common locations include Peru, Spain, and various localities across the USA.

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