Geology Rock Identifier

Identify rocks and minerals by their physical characteristics.

Usage

Describe the rock's appearance and properties, and I'll help identify it.

Examples

• "I found a shiny, layered rock that's very hard"
• "What type of rock has visible crystals and is pink?"
• "Identify a smooth black rock that's glassy"

Guidelines

• Note color, luster, hardness, and texture
• Test hardness using the Mohs scale
• Check for streak color on unglazed porcelain
• Observe crystal structure if visible
• Context of where you found it helps identification