metamorphic

Polished purple-and-cream jasper (likely)

Silica-rich microcrystalline quartz/chalcedony, SiO₂, colored by iron/manganese minerals

AI-generated identification · may be incorrect

Hardness about 6.5–7 Mohs; opaque, cream to lavender-purple, fine-grained, with a smooth tumbled surface and dull-to-waxy luster. No visible cleavage; conchoidal fracture is typical. The purple pattern may reflect manganese-bearing material or altered volcanic rock.

Identified September 15, 2026More metamorphic →

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Physical properties

Formation & geological history

Most likely a silicified volcanic or sedimentary rock formed by groundwater filling and replacing cavities, later weathered and polished. Exact geological age cannot be determined from the photograph. This is plausible in the Pfalz–Glan region, where volcanic rocks and silica-rich secondary minerals occur.

Uses & applications

Used as inexpensive lapidary material, cabochons, tumbled stones, ornaments, and decorative objects; generally modest collector value.

Geological facts

The specimen’s irregular purple veining and cream matrix resemble jasper varieties marketed as “lavender jasper,” though trade names are not strict scientific identifications.

Field identification & locations

In the field, distinguish it from dyed stone by its opaque natural pattern, uniform color inside scratches, hardness near quartz, and lack of bubbling in acid. A streak test, hardness test, and magnification would improve certainty; it could also be altered rhyolite or purple-stained chalcedony.