Bloodstone

Hardness: 6.5-7 on Mohs scale (due to Quartz content). Color: Dark green with distinct red/brown spots or inclusions. Luster: Vitreous to dull. Crystal structure: Typically massive, granular, or cryptocrystalline. Cleavage: None. Specific Gravity: 3.2-3.5.

Bloodstone is a cryptocrystalline variety of quartz, specifically a type of chalcedony. It forms as a result of regional or contact metamorphism of oceanic crust or sediments that have been enriched with iron minerals. The green color comes from chlorite minerals, and the red spots are due to iron oxides, typically hematite. It formed during various geological periods when these conditions were present.

Historically, Bloodstone was used for seals, signet rings, and carvings due to its hardness and intricate patterns. Today, it is primarily used as a gemstone in cabochons, beads, and tumbled stones for jewelry. It's also popular in lapidary arts, ornamental objects, and as a collector's stone.

Bloodstone is also known as Heliotrope. It was traditionally considered the 'stone of courage' and was believed to possess mystical properties, including the ability to stop bleeding and cure snakebites. Ancient warriors carried it as an amulet. Some legends say the red spots are traces of Christ's blood, linking it to the Crucifixion.

In the field, Bloodstone is identified by its characteristic dark green body color with distinctive reddish-brown to bright red spots or patches. It is opaque to slightly translucent. Its hardness (able to scratch glass) can help differentiate it from softer imitators. It is commonly found in India (the primary source), Australia, Brazil, China, the United States (California, Oregon), and some parts of Europe. Look for it in riverbeds, alluvial deposits, or within metamorphic rock formations.