sedimentary (chemically precipitated)

Jasper (specifically Bloodstone or Heliotrope variety)

Silicon Dioxide (SiO2) with iron oxide inclusions

Hardness: 6.5-7 (Mohs scale); Color: Dark green with brownish-red spots or streaks; Luster: Vitreous to waxy; Crystal Structure: Trigonal/Microcrystalline (cryptocrystalline quartz); Cleavage: None/Conchoidal fracture; Specific Gravity: 2.58-2.91

Hardness: 6
Color: Dark green with brownish-red spots or streaks
Luster: Vitreous to waxy

Identified March 21, 2026More sedimentary (chemically precipitated) →

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Physical properties

Formation & geological history

Formed through the infiltration of silica-rich hydrothermal fluids into volcanic rock cavities or sedimentary layers. The red inclusions are typically iron oxides like hematite, while the green base comes from chlorite or actinolite inclusions. Common in Cretaceous and Cenozoic formations.

Uses & applications

Used primarily in lapidary work for jewelry (cabochons), seals, small carvings, and as a popular specimen for rock collectors and metaphysical practitioners.

Geological facts

Bloodstone was traditionally the birthstone for March before modern changes. In medieval times, the red spots were believed to represent the blood of Christ, leading to its popular use in religious carvings and 'amulets of health'.

Field identification & locations

Identify in the field by its dark green waxy surface and characteristic shell-like (conchoidal) fractures. Found commonly in India, Brazil, Australia, and the western United States. To verify, test hardness against steel (it should scratch steel and glass).

Other sedimentary (chemically precipitated) specimens

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Silicon Dioxide (SiO2) with iron oxide and hydroxide inclusions

sedimentary (chemically precipitated)

Banded Calcite (Mexican Onyx)

Calcium Carbonate (CaCO3)

mineral

Jasper (likely Polychrome or Desert Jasper)

Silicon Dioxide (SiO2) with impurities

sedimentary (chemically precipitated mineral)

Jasper (with orbicular/unakitoid tendencies)

Silicon Dioxide (SiO2) with iron and epidote inclusions

sedimentary (chemically precipitated) or metamorphic

Jasper (likely a variety of Yellow or Mustard Jasper)

Silicon Dioxide (SiO2) - Microcrystalline Quartz

sedimentary (chemically precipitated mineral)

Bumblebee Jasper (technically a type of Agate/Anhydrite)

Calcite and Anhydrite with inclusions of Realgar and Orpiment (As2S3)

sedimentary