Rocks & Minerals

Notes in this section

• Agate

  Wikimedia Commons Agate Chalcedony Hardness: 6.5–7 Streak: White BasaltGraniteObsidianRhyolite

• Amethyst

  Wikimedia Commons Amethyst Quartz Hardness: 7 Streak: White BasaltGraniteObsidianRhyolite

• Aventurine

  Wikimedia Commons Aventurine Quartz Hardness: ≈6.5 Approximate Streak: White BasaltGraniteObsidianRhyolite

• Banded Iron Formation

  Wikimedia Commons Banded Iron Formation Sedimentary Hardness: ≈5.5–7 Approximate Banded iron formation is a Precambrian sedimentary rock of alternating iron‑rich layers (hematite or magnetite)...

• Banded Jasper

  Wikimedia Commons Banded Jasper Jasper Hardness: 6.5–7 Streak: White BasaltGraniteObsidianRhyolite

• Basalt

  Wikimedia Commons Basalt Igneous Hardness: ≈6 Approximate BasaltGraniteObsidianRhyolite

• Breccia

  Wikimedia Commons Breccia Sedimentary Hardness: ≈2–7 Approximate BasaltGraniteObsidianRhyolite

• Calcite

  Calcite Minerals Hardness: 3 Streak: White

• Chalcedony

  Wikimedia Commons Chalcedony Minerals Hardness: 6.5–7 Streak: White BasaltGraniteObsidianRhyolite

• Chalcedony Varieties

  Chalcedony Varieties Chalcedony

• Chert

  Wikimedia Commons Chert Quartz Hardness: 7 Streak: White BasaltGraniteObsidianRhyolite

• Coldwater Agate

  Encyclopedia Gemstonia Coldwater Agate Chalcedony Hardness: 6.5–7 Streak: White BasaltGraniteObsidianRhyolite

• Conglomerate (Puddingstone)

  Wikimedia Commons Conglomerate (Puddingstone) Sedimentary Hardness: ≈2–7 Approximate BasaltGraniteObsidianRhyolite

• Epidote

  Wikimedia Commons Epidote Minerals Hardness: 6–7 Streak: Greyish white BasaltGraniteObsidianRhyolite

• Feldspar

  Wikimedia Commons Feldspar Minerals Hardness: 6–6.5 Streak: White BasaltGraniteObsidianRhyolite

• Fire Agate

  Wikimedia Commons Fire Agate Chalcedony Hardness: 6.5–7 Streak: White BasaltGraniteObsidianRhyolite

• Garnet

  Wikimedia Commons Garnet Minerals Hardness: 6.5–7.5 Streak: White BasaltGraniteObsidianRhyolite

• Gneiss

  Wikimedia Commons Gneiss Metamorphic Hardness: ≈6–7 Approximate BasaltGraniteObsidianRhyolite

• Granite

  Wikimedia Commons Granite Igneous Hardness: ≈6–7 Approximate BasaltGraniteObsidianRhyolite

• Heliotrope (Bloodstone)

  Wikimedia Commons Heliotrope (Bloodstone) Chalcedony Hardness: 6.5–7 Streak: White BasaltGraniteObsidianRhyolite

• Jasper

  Wikimedia Commons Jasper Minerals Hardness: 6.5–7 Streak: White BasaltGraniteObsidianRhyolite

• Jasper Varieties

  Jasper Varieties Jasper

• Lake Superior Agate

  Wikimedia Commons Lake Superior Agate Chalcedony Hardness: 6.5–7 Streak: White BasaltGraniteObsidianRhyolite

• Limestone

  Wikimedia Commons Limestone Sedimentary Hardness: 3 BasaltGraniteObsidianRhyolite

• Marble

  Wikimedia Commons Marble Metamorphic Hardness: 3–4 BasaltGraniteObsidianRhyolite

• Mica

  Mica Minerals Hardness: 2–2.5 Streak: White

• Milky Quartz

  Wikimedia Commons Milky Quartz Quartz Hardness: 7 Streak: White BasaltGraniteObsidianRhyolite

• Moss Agate

  Wikimedia Commons Moss Agate Chalcedony Hardness: 6.5–7 Streak: White BasaltGraniteObsidianRhyolite

• Obsidian

  Wikimedia Commons Obsidian Igneous Hardness: 5–6 BasaltGraniteObsidianRhyolite

• Onyx

  Wikimedia Commons Onyx Chalcedony Hardness: 6.5–7 Streak: White BasaltGraniteObsidianRhyolite

• Picture Jasper

  Wikimedia Commons Picture Jasper Jasper Hardness: 6.5–7 Streak: White BasaltGraniteObsidianRhyolite

• Quartz

  Wikimedia Commons Quartz Minerals Hardness: 7 Streak: White BasaltGraniteObsidianRhyolite

• Quartz Varieties

  Quartz Varieties Quartz

• Quartzite

  Wikimedia Commons Quartzite Metamorphic Hardness: 7 BasaltGraniteObsidianRhyolite

• Rhyolite

  Wikimedia Commons Rhyolite Igneous Hardness: ≈6–7 Approximate BasaltGraniteObsidianRhyolite

• Rose Quartz

  Wikimedia Commons Rose Quartz Quartz Hardness: 7 Streak: White BasaltGraniteObsidianRhyolite

• Sandstone

  Wikimedia Commons Sandstone Sedimentary Hardness: ≈6–7 Approximate BasaltGraniteObsidianRhyolite

• Schist

  Wikimedia Commons Schist Metamorphic Hardness: ≈4–7 Approximate BasaltGraniteObsidianRhyolite

• Shale

  Wikimedia Commons Shale Sedimentary Hardness: ≈3 Approximate BasaltGraniteObsidianRhyolite

• Slate

  Wikimedia Commons Slate Metamorphic Hardness: ≈3–4 Approximate BasaltGraniteObsidianRhyolite

• Smoky Quartz

  Wikimedia Commons Smoky Quartz Quartz Hardness: 7 Streak: White BasaltGraniteObsidianRhyolite

• Soapstone

  Wikimedia Commons Soapstone Metamorphic Hardness: 1–2 BasaltGraniteObsidianRhyolite

• Tiger Eye

  Wikimedia Commons Tiger Eye Quartz Hardness: 6.5–7 Streak: White BasaltGraniteObsidianRhyolite

• Unakite

  Wikimedia Commons Unakite Metamorphic Hardness: ≈6–7 Approximate BasaltGraniteObsidianRhyolite