Basalt with Quartz/Calcite vein

Hardness: 6 (matrix) to 7 (vein), Color: Dark grey to black with white vein, Luster: Dull/earthy matrix with vitreous vein, Crystal structure: Aphanitic (fine-grained), Cleavage: None

Formed from the rapid cooling of magnesium-rich and iron-rich lava at the earth's surface. The white vein formed later as mineral-rich hydrothermal fluids filled a crack in the rock and crystallized. These rocks vary in age but are common in volcanic terrains throughout earth's history.

Primarily used in construction (crushed stone, asphalt, concrete) or as decorative garden stones. This specific heart-shaped piece is a novelty collector's item.

Basalt is the most common rock type in Earth's crust and makes up most of the ocean floor. It is also found on the Moon and Mars.

Identify by its dark, dense matrix and fine grain. Heart-shaped stones are formed naturally by water erosion in rivers or beaches. Commonly found in volcanic regions or coastal areas with high energy wave action.