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Rock Identification
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Rock Identification

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  1. Rock Identification Click Here to take a practice Rock ID Test Click Here to Learn more about a specific rock. Learn Your Rocks Rock ID Practice Test Quartz Sandstone Obsidian Garnet Mica Schist

  2. Learn Your Rocks Select a rock to learn more about it. Gneiss Granite Conglomerate Obsidian Rhyolite Garnet Mica Schist Pumice Quartzite Quartz Sandstone Gabbro Breccia Fossillferous Limestone Coquina Andisite Mica Schist Rock Salt Scoria Marble Basalt Diorite Chalk Slate Shale Chert Agate

  3. Rock Review Practice Test 1 6 11 16 21 2 7 12 17 22 3 8 13 18 23 4 9 14 19 24 5 10 15 20 25

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  29. Gneiss A banded or foliated rock usually made from some type of granite. Color will vary considerably based on the amount and kind of minerals found in the original granitic rock. Acid Test No Reaction Scratch Test Will scratch glass Rock Type Metamorphic Particle Size, Texture Foliated, Crystalline Mineral Composition Amphibole, Feldspar, Quartz

  30. Obsidian A black, banded, or spotted hard volcanic glass that is formed by very rapid cooling of lava. Historically, many different peoples have used the glass rock to fashion sharp tools such as knives and spear points. Acid Test No Reaction Scratch Test Will scratch glass Rock Type Igneous, Extrusive Particle Size, Texture Compact Glassy Mineral Composition Silica Rich

  31. Pumice A light, porous, fibrous, glassy lava, used in solid form as an abrasive and in powdered form as a polish and an abrasive. Sometimes it’s density is low enough that it will float in water. Pumice is lava that had a lot of gases in it and cooled quickly on the surface of the earth. Acid Test No Reaction Scratch Test Will scratch glass Rock Type Igneous, Extrusive Particle Size, Texture Compact, Fibrous, Glassy Mineral Composition Silica Rich

  32. Conglomerate A rock consisting of heterogeneous pebbles and gravel embeded in a cement made of clay, silt and sand particles. Acid Test No Reaction Scratch Test Will scratch glass Rock Type Sedimentary Particle Size, Texture Gravel and smaller sized particles Mineral Composition Varied, heterogeneous mixture

  33. Garnet Mica Schist A mica rich leafed foliated rock that is formed under great heat and pressure. Garnet crystals have developed on the rock as it was being formed. The rock may be silvery white to various shades of grey and exhibit yellow to brown tones depending on the oxidation of the various minerals in the rock sample. Acid Test No Reaction Scratch Test Will scratch glass Rock Type Metamorphic Particle Size, Texture Leaf like foliation Mineral Composition Muscovite and Garnet

  34. Quartz Sandstone A rock formed by the consolidation and compaction of generally rounded sand particles cemented together by clay, silt, or silica particles. The color will vary based on the trace elements present in the quartz sand particles. The rock may show color banding and cross-bedding patterns. Acid Test No Reaction Scratch Test Will scratch glass Rock Type Sedimentary Particle Size, Texture Sand size, crystalline Mineral Composition Quartz

  35. Fossillferous Limestone A common sedimentary rock consisting mostly of calcium carbonate which contains fossils of various fresh and or salt water shell fish. It is used as a building stone, and in the manufacture of lime, carbon dioxide, and cement. Acid Test Reacts with Acid Scratch Test Will not scratch glass Rock Type Sedimentary Particle Size, Texture Sand size, smooth Mineral Composition Calcite

  36. Quartzite A rock formed by the metamorphism of quartz sandstone. Quartz is a very hard mineral composed of silica. Quartzite can be a wide variety of colors depending on what elements are present in small amounts. Quartzite is very prevalent and is found worldwide. Acid Test No Reaction Scratch Test Will scratch glass Rock Type Metamorphic Particle Size, Texture Non-foliated, Crystalline Mineral Composition Quartz

  37. Granite A common hard igneous rock consisting mostly of quartz, orthoclase or microcline, and mica. Granite is used for building and paving. Acid Test No Reaction Scratch Test Will scratch glass Rock Type Igneous, Intrusive Particle Size, Texture Course grained, Crystalline Mineral Composition Quartz, Potassium Feldspar

  38. Rhyolite A volcanic rock similar to granite in composite that cooled much more rapidly than granite that usually exhibits flow lines. Color may vary. Acid Test No Reaction Scratch Test Will scratch glass Rock Type Igneous, Extrusive Particle Size, Texture Fine grained Mineral Composition Light color indicates a felsic composition

  39. Diorite Any of various intermediate to dark granite textured crystalline rocks rich in plagioclase. Acid Test No Reaction Scratch Test Will scratch glass Rock Type Igneous, Intrusive Particle Size, Texture Course grained Crystalline Mineral Composition Amphibole, Intermediate Feldspar