Exotica Jasper Identification Guide

What Exotica Jasper Looks Like

Exotica jasper (also marketed as Sci-Fi jasper) is a trade name for a colorful patterned jasper/chalcedony, a microcrystalline quartz, typically from Madagascar. "Jasper" here means an opaque, iron- and clay-rich variety of chalcedony.

• Color: bold mixes of cream, gray, green, mustard-yellow, brick-red, brown, and black in swirling, mottled, or orbicular patterns.
• Luster: waxy to dull; takes a glassy polish.
• Transparency: opaque (thin edges may be slightly translucent).
• Form: massive; cut into cabochons, slabs, and tumbles. No crystal faces.

Step-by-Step Field-ID Checklist

1. Confirm hardness. It scratches glass and a steel knife (Mohs ~6.5-7); soft "jaspers" are misnamed.
2. Check the break. Look for smooth conchoidal fracture typical of quartz-family stones.
3. Assess pattern. Multicolored swirls, blends, and patches with smooth gradational boundaries point to a silica jasper.
4. Feel the polish. It takes a high, glassy polish and feels solid and cool.
5. Rule out dye. Natural jasper color is consistent through the stone; dye concentrates in cracks.

Key Diagnostic Tests

• Mohs hardness: ~6.5-7 (scratches glass).
• Streak: white.
• Cleavage/fracture: none; conchoidal to splintery fracture.
• Specific gravity: ~2.6, typical of chalcedony.
• Acid: no fizz (silica, not carbonate).
• No magnetism.

Common Look-Alikes and How to Tell Them Apart

• Ocean jasper/polychrome jasper (also Madagascar): closely related and may overlap; trade names are loosely applied. Orbicular eyes suggest ocean jasper, broad swirls suggest polychrome/exotica.
• Dyed howlite/magnesite: much softer (3-3.5), scratched by a knife, and dye pools in veins; Exotica jasper is hard quartz.
• Agate: translucent with concentric banding; jasper is opaque and patchy.
• Marble/painted stone: marble fizzes in acid and is softer (3); resin or painted fakes feel light and warm and scratch easily.

Where It Is Typically Found

Exotica/Sci-Fi jasper is sourced primarily from Madagascar, which produces many colorful patterned jaspers. Jasper in general forms where silica-rich fluids cement or replace fine sediment and volcanic ash, and is found worldwide; the specific banded patterning of Exotica reflects iron and clay impurities in the silica.