sedimentary

Jasper

Silicon dioxide (SiO2)

Hardness: 6.5-7 (Mohs); Color: Pinkish-orange to red; Luster: Dull to vitreous (waxy); Crystal Structure: Microcrystalline (trigonal); Cleavage: None; Specific Gravity: 2.58-2.91.

Hardness: 6
Color: Pinkish-orange to red
Luster: Dull to vitreous (waxy)

Identified June 12, 2026More sedimentary →

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Physical properties

Hardness: 6.5-7 (Mohs); Color: Pinkish-orange to red; Luster: Dull to vitreous (waxy); Crystal Structure: Microcrystalline (trigonal); Cleavage: None; Specific Gravity: 2.58-2.91.

Formation & geological history

Formed from the consolidation of fine-grained silica in sedimentary environments or hydrothermal veins. Often found in Cretaceous and Paleogene deposits of the Volga-Saratov region.

Uses & applications

Commonly used in lapidary arts for beads, polishing (tumbled stones), and decorative ornaments. Historically used for making tools.

Geological facts

The specimen resembles the 'Saratov Jasper' or similar local silicates common in the Saratov region. The user's note 'розовый цвет' (pink color) suggests iron oxide impurities typical of quartz-rich sedimentary rocks in this river drainage basin.

Field identification & locations

Identifiable by its conchoidal fracture and hardness (cannot be scratched by steel). Found commonly in river gravels and quarries around the Saratov-Engels region (51.5°N, 45.9°E).