Gray Crystals

Gray crystals, stones & gemstone names

• Diamond Mohs 10 (defining mineral)
• Bismuth
• Basalt
• Pearl Mohs 2.5–4.5
• Agate Mohs 6.5–7
• Cinnabar Mohs 2.0–2.5
• Hematite Mohs 5.5–6.5
• Chalcedony Mohs 6–7
• Magnetite Mohs 5.5–6.5
• Galena Mohs 2.5–2.75
• Labradorite Mohs 6–6.5
• Rhyolite
• Kyanite Mohs 4.5–5 parallel to one axis 6.5–7 perpendicular to that axis
• Smoky Quartz Mohs 7 – lower in impure varieties (defining mineral)
• Rhodochrosite Mohs 3.5–4
• Realgar Mohs 1.5–2
• Serpentine Mohs 2.5–6 (original) 3.5–4.0 (antigorite) 2.5 (lizardite) 2.5–3.0 (chrysotile)
• Iron Meteorite
• Lepidolite Mohs 2.5–3
• Rhodonite Mohs 5.5–6.5
• Marcasite Mohs 6–6.5
• Prehnite Mohs 6–6.5
• Smithsonite Mohs 4.5
• Larvikite
• Molybdenite Mohs 1–1.5
• Pietersite Mohs 7
• Petalite Mohs 6–6.5
• Hemimorphite Mohs 4.5–5
• Hypersthene Mohs 5.5–6
• Danburite Mohs 7 – 7.5
• Nuummite Mohs 5.5 - 6.0
• Datolite Mohs 5 to 5.5
• Kunzite Mohs 6.5–7