sedimentary

Jasper (Tiger Eye variety transition)

Silicon Dioxide (SiO2) with iron oxide inclusions

Hardness: 6.5-7 (Mohs scale); Color: Ochre, golden-brown, and dark bands; Luster: Waxy to vitreous; Crystal Structure: Hexagonal (cryptocrystalline); Cleavage: None (conchoidal fracture); Specific Gravity: 2.58–2.91

Hardness: 6
Color: Ochre, golden-brown, and dark bands
Luster: Waxy to vitreous

Identified March 22, 2026More sedimentary →

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Physical properties

Formation & geological history

Formed through the replacement of crocidolite asbestos fibers by silica (pseudomorphism), combined with the oxidation of iron. This specimen appears to be in an intermediate stage between iron-rich Jasper and Tiger's Eye. Found typically in Precambrian formations.

Uses & applications

Used primarily in lapidary work for cabochons, beads, and ornamental carvings. Also popular in jewelry and as a meditation stone in the metaphysical community.

Geological facts

Jasper is an opaque variety of chalcedony. The name comes from the Greek 'iaspis', meaning 'spotted stone.' This specific banded variety often shares a geological environment with Banded Iron Formations (BIFs) which are over 2 billion years old.

Field identification & locations

Identify in the field by its opacity, hardness (will scratch glass), and distinctive band patterns. Common locations include South Africa, Australia, Brazil, and India. Collectors should look for chatoyancy or high-contrast banding.

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