Basalt Quarry on Palouse River near Potlatch

• Mineral Photos
• Location Map

Minerals Present

• Aragonite: Acicular, radiating, white to brownish-yellow crystals in basalt vugs.
• Calcite: Yellowish-white, marble-like masses in basalt vugs.
• Goethite: Botryoidal, brownish-black aggregates and thin, brown coatings over siderite.
• Hematite: Deep red, compact, granular masses.
• Limonite: Yellowish-brown, earthy, porous masses covering basalt.
• Opal: Botryoidal, white to clear, globular masses covering basalt.
• Siderite: Pale brown to yellow, botryoidal masses in basalt vugs.