Gemstone profile and identification guide

Dalmatian Jasper

Dalmatian jasper is a trade name for spotted ornamental rock, not a strict quartz jasper species.

6.5 Mohs Cream, Black Spots Ornamental Igneous-Sedimentary Rock Trade Material

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Overview

Dalmatian jasper is a trade name for spotted ornamental rock, not a strict quartz jasper species.

Did you know? Dalmatian jasper is widely accepted as a trade name rather than a strict mineralogical species label.

Use this profile as a collector reference and educational guide for quick on-page comparison, then validate with the interactive identification system.

Identification

Name: Dalmatian Jasper

Scientific classification: Ornamental Igneous-Sedimentary Rock Trade Material

Hardness: 6.5 Mohs

Transparency: opaque

Lustre: waxy

Crystal system: Composite aggregate

Primary colour: Cream

Secondary colour: Black Spots

Colour family: Whites & Neutrals

Cream matrix with contrasting black spots and opaque texture are the key identifiers.

Verification Status

Status: verified-core-fields

Reference priority: GIA, Gem-A, Mindat, International Gem Society

Core identity, locality, and physical-property fields reviewed against standard gemological references.

Trade-name entries include treatment/composition disclosures where applicable.

Physical Properties

Hardness category: hard

Hardness value: 6.5 Mohs

Chemical composition: Light feldspathic matrix with dark mineral spots (often arfvedsonite/riebeckite or other mafic inclusions)

Crystal system: Composite aggregate

Common locations: Mexico

Learn more: Gem-A gemstone education resources.

Colour Variations

Cream to beige background with black spot patterns.

Optical effects: Spotted Pattern

Detailed Gemology

Mineral species: Composite ornamental rock

Mineral group: Trade-pattern rock category

Chemical formula: Light feldspathic matrix with dark mineral spots (often arfvedsonite/riebeckite or other mafic inclusions)

Mohs hardness: 6.5

Crystal system: Composite aggregate

Lustre: waxy

Transparency: opaque

Streak: White

Cleavage: Variable by component

Fracture: Uneven

Specific gravity: 2.6-2.8 (variable)

Refractive index: Variable by component

Optical phenomena: Spotted patterning

Colour range: Cream/beige with black spots

Common inclusions: Dark mafic spots in light feldspathic matrix

Geological environment: Igneous-sedimentary composite rock contexts

Principal mining regions: Mexico

Important commercial sources: Most commercial dalmatian stone is sourced from Mexico

Historical significance: Popular modern decorative stone in bead markets.

Common treatments: Dyeing and stabilization may occur.

Synthetic or imitation forms: Printed resin and dyed composite imitations exist.

Common look-alikes: Spotted rhyolite and dyed composites

Jewellery uses: Dalmatian Jasper is used chiefly for Pattern-focused beads and cabochon jewellery.. In the trade it is commonly fashioned as cabochons, beads, carvings, and polished ornamental pieces, with Mohs hardness 6.5 guiding suitable jewellery applications.

Care recommendations: Generally durable for jewellery; avoid severe impacts and harsh chemical cleaners.

Cross-check profile data with GIA Gem Encyclopedia and Mindat entry for Dalmatian Jasper.

Formation

Forms as composite rock where dark mineral crystals occur in lighter silicate matrix.

Origin

Most commercial dalmatian stone is sourced from Mexico

Uses

Best for: Dalmatian Jasper is used chiefly for Pattern-focused beads and cabochon jewellery.. In the trade it is commonly fashioned as cabochons, beads, carvings, and polished ornamental pieces, with Mohs hardness 6.5 guiding suitable jewellery applications.

Ideal uses: Pattern-focused beads and cabochon jewelry.

Care

Generally durable for jewellery; avoid severe impacts and harsh chemical cleaners.

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