gemstone

Polished dark green stone, possibly bloodstone (heliotrope)

Chalcedony, microcrystalline quartz (SiO₂); identification is uncertain from the image

AI-generated identification · may be incorrect

A rounded, polished, opaque dark-green specimen with faint reddish-brown mottling. If bloodstone, hardness is about 6.5–7 Mohs, luster waxy to vitreous, and crystal structure microcrystalline; no visible cleavage.

Identified October 12, 2026More gemstone →

Explore Polished dark green stone, possibly bloodstone (heliotrope) in the encyclopedia →

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Physical properties

Formation & geological history

Bloodstone forms as iron-oxide-colored chalcedony in silica-rich fluids, commonly filling cavities in volcanic rocks. Its geological age varies by deposit; the pictured appearance alone cannot establish the stone or source.

Uses & applications

Polished bloodstone is used for beads, cabochons, carvings, and collectibles; chalcedony may also be used ornamentally.

Geological facts

Classic bloodstone has distinct red spots on a green ground, but those markings are not clearly visible here.

Field identification & locations

The smooth, hard, waxy-looking surface is consistent with a polished siliceous stone, but confirm identity by inspection for red inclusions and gemological testing. Bloodstone occurs notably in India, Brazil, and Australia.