sedimentary

Jasper

Silicon dioxide (SiO2)

Hardness: 6.5-7 (Mohs scale); Color: Reddish-brown, earth tones; Luster: Waxy to dull; Crystal Structure: Microcrystalline; Specific Gravity: 2.58-2.91

Hardness: 6
Color: Reddish-brown, earth tones
Luster: Waxy to dull

Identified July 9, 2026More sedimentary →

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Physical properties

Hardness: 6.5-7 (Mohs scale); Color: Reddish-brown, earth tones; Luster: Waxy to dull; Crystal Structure: Microcrystalline; Specific Gravity: 2.58-2.91

Formation & geological history

Formed through the accumulation of fine-grained silica particles in sedimentary or volcanic environments. The red-brown color is typically due to iron oxide impurities (hematite or goethite) within the cryptocrystalline quartz structure.

Uses & applications

Commonly used for lapidary work, jewelry (cabochons), interior decoration, and as a popular collector's stone. Historically used for making tools due to its conchoidal fracture.

Geological facts

Jasper was a favorite gem in the ancient world; its name can be traced back to Greek, Hebrew, Assyrian, and Persian languages. It is often referred to as the 'supreme nurturer' in metaphysical circles.

Field identification & locations

Identify in the field by its opaque nature (unlike agate which is translucent), its smooth conchoidal fracture, and extreme hardness—it will easily scratch glass. Commonly found in stream beds and areas with volcanic activity.