Map Jasper Identification Guide
Identifying map jasper by its cartographic landscape patterns, earthy colors, and quartz-family hardness and tests.
Read the full Map Jasper encyclopedia entry →
What Map Jasper Looks Like
Map jasper is an opaque microcrystalline quartz (chalcedony/jasper) named for patterns that resemble a map or aerial landscape: irregular outlined regions, boundary-like veins, and zones of contrasting color suggesting continents, coastlines, or terrain. Colors are earthy - tan, beige, brown, cream, gray, and reddish tones, often with darker dendritic or seam-like lines.
- Color: tan, brown, cream, gray, reddish, with map-like outlined zones
- Luster: waxy to dull; glassy when polished
- Transparency: opaque
- Texture/form: sedimentary-looking banding and outlined "territories"
Step-by-Step Field ID Checklist
- Confirm jasper: opaque, fine-grained silica with a waxy feel and conchoidal fracture.
- Look for the map pattern - bounded color regions and line-work resembling a map or terrain.
- Test hardness - it scratches glass and resists a steel knife (Mohs ~6.5-7).
- Check the streak - white.
- Apply a drop of acid - no fizz confirms silica, not carbonate.
Key Diagnostic Tests
- Mohs hardness: 6.5-7; will not be scratched by steel.
- Streak: white.
- Cleavage/fracture: none; conchoidal to uneven fracture.
- Acid: inert (no reaction), separating it from patterned limestones and marbles.
- Specific gravity: about 2.6, typical of quartz.
Common Look-Alikes and How to Tell Them Apart
- Picture jasper: very similar; "map jasper" emphasizes outlined map-like territories, while picture jasper shows scenic landscapes. The mineral properties are identical.
- Landscape/scenic agate: agate is translucent with banding; map jasper is fully opaque.
- Ruin marble (landscape marble): fizzes in acid and is soft (Mohs 3); map jasper does not react and is much harder.
- Dendritic jasper: features tree-like manganese dendrites rather than bounded map regions.
Where It Is Typically Found
Map jasper is found in jasper-producing regions worldwide, with notable material from the western United States (Oregon, Idaho, Nevada, Arizona), Africa, and India, typically in silica-rich sedimentary and volcanic settings.
Frequently asked questions
How can you tell if it's real map jasper?
Confirm it is jasper (opaque, waxy, Mohs ~6.5-7, scratches glass, white streak, no acid reaction), then look for the cartographic pattern of bounded color regions and line-like seams resembling a map or landscape.
What does map jasper look like?
It is an opaque earthy-toned jasper in tan, brown, cream, gray, and reddish colors, with outlined zones and veins that resemble continents, coastlines, or aerial terrain.
Map jasper vs picture jasper: what is the difference?
They are mineralogically the same opaque jasper. 'Map jasper' highlights map-like bounded territories, while 'picture jasper' emphasizes scenic landscape imagery; the names describe pattern, not composition.
Is map jasper natural?
Yes, the map-like patterns form naturally from iron and mineral staining, sedimentary layering, and veining in silica-rich rock; the colors are not dyed in genuine specimens.
Map Jasper identified by the community
Recent Map Jasper specimens identified with Rock Identifier.
