igneous
Vesicular basalt with pink mineral inclusions
Basalt, likely porphyritic/vesicular basalt; inclusions may be calcite, zeolite, or weathered feldspar
AI-generated identification · may be incorrectDark gray to black, fine-grained, low-gloss matrix with rounded vesicles and contrasting pale pink fillings/inclusions. Hardness is typically 5–6 for basalt; specific gravity about 2.8–3.0, with no consistent cleavage.
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Physical properties
Dark gray to black, fine-grained, low-gloss matrix with rounded vesicles and contrasting pale pink fillings/inclusions. Hardness is typically 5–6 for basalt; specific gravity about 2.8–3.0, with no consistent cleavage.
Formation & geological history
An extrusive mafic igneous rock formed when basaltic lava cooled rapidly at or near the surface, trapping gas bubbles as vesicles. The pink material likely crystallized later from groundwater or represents altered feldspar; exact age and identification require laboratory testing.
Uses & applications
Commonly used as aggregate, road stone, riprap, landscaping rock, and building stone; attractive specimens are collected but usually have modest value.
Geological facts
Its fine texture indicates rapid cooling, while vesicles record volcanic gas release. Pink secondary minerals in basalt are commonly calcite, quartz, or zeolites, and can resemble amygdules.
Field identification & locations
Identify by its black fine-grained matrix, high density, lack of visible large crystals, and gas cavities; a vinegar or dilute-acid test may effervesce if the pink fillings are calcite. Common worldwide in volcanic regions, including Hawaii, Iceland, India, and the Pacific Northwest.
