Gray Limestone Pebble
Calcium Carbonate (CaCO3)
sedimentary
Category
Organic Gem Material (Botanical)
Browse organic gem material (botanical) specimens identified by the Rock Identifier community.
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Sandstone (likely Quartzose)
Arenite (SiO2 principal mineral)
sedimentary
Sandstone (with Iron Staining)
Clastic Sedimentary Rock (primarily Quartz with Limonite/Goethite staining)
sedimentary
Brown Jasper / River Siltstone
Silicon Dioxide (SiO2) with iron oxide impurities
sedimentary
Moonstone
Orthoclase (Potassium Aluminum Silicate), Formula: (K,Na)AlSi3O8
mineral
River Pebble (Gravel)
Clastic sedimentary rock (likely Siltstone or Mudstone pebble; SiO2 with various impurities)
sedimentary
Sandstone (Ferruginous)
Arenite (SiO2 with Fe2O3 cement)
sedimentary
Coquina or Fossilized Shell Aggregate
Calcareous bioclastic sedimentary rock (CaCO3)
sedimentary
Silver (Morgan Dollar)
Native Silver (Ag) - 90% Silver, 10% Copper alloy
mineral
Quartz (Iron-Stained)
Silicon Dioxide (SiO2)
mineral
Amethyst
Silicon Dioxide (SiO2) with iron impurities
mineral
Rose Quartz
Silicon Dioxide (SiO2) with trace amounts of titanium, iron, or manganese
mineral
Amethyst
Silicon Dioxide (SiO2) with Iron impurities
mineral
Rose Quartz
Silicon Dioxide (SiO2) with trace amounts of titanium, iron, or manganese
mineral
Milky Quartz
Silicon Dioxide (SiO2)
mineral
Ocean Jasper
Orbicular Jasper, Chalcedony (SiO2)
mineral
Milky Quartz
Quartz (Silicon Dioxide, SiO2)
mineral
Chert (often called Jasper or Flint in this color variety)
Silicon Dioxide (SiO2)
sedimentary
Ironstone Concretion
Siderite or Hematite Concretion
sedimentary
Wood Paneling
Engineered Wood / Plywood Paneling
not a rock
Chert
Chert (Microcrystalline Quartz, SiO2)
sedimentary
Chert (River Pebble)
Microcrystalline Quartz (SiO2)
sedimentary
Chert (Beach Pebble)
Silicon Dioxide (SiO2)
sedimentary
Oyster Shell Fragment
Crassostrea virginica (or related Bivalvia)
fossil
Chert (Carnelian/Jasper variety)
Microcrystalline Quartz (SiO2)
sedimentary
Petrified Bone Pebble
Silicified Fossilized Bone
fossil
Anthracite Coal
Anthracite
metamorphic
Chert (often called Jasper in this color)
Microcrystalline quartz (SiO2)
sedimentary
Quartz Geode
Crystalline Silicon Dioxide (SiO2) in sedimentary/volcanic host
mineral
Chert (often called Flint)
Silicon Dioxide (SiO2)
sedimentary
Chert (Smoky variety)
Microcrystalline Quartz (SiO2)
sedimentary
Chert (Nodule)
Silicon Dioxide (SiO2)
sedimentary
Chert (Siliceous Mudstone variant)
Microcrystalline quartz (SiO2)
sedimentary
Fossilized Crab Carapace (Concretion)
Decapoda (fossil), typically preserved in calcite or siderite concretion
sedimentary
Glauconitic Sandstone (Greensand)
Glauconitic quartz wacke or arenite
sedimentary
Fossiliferous Limestone
Biogenic Limestone with Brachiopod/Crinoid fragments
sedimentary
Green Chert
Silicon Dioxide (SiO2)
sedimentary
Gray Chert (River Pebble)
Microcrystalline Quartz (SiO2)
sedimentary
Chert (often called Flint or Jasper when red)
Silicon Dioxide (SiO2) - Microcrystalline Quartz
sedimentary
Chert (Jasper)
Microcrystalline Quartz (SiO2)
sedimentary
Chert (White Chert or Flint)
Microcrystalline Quartz (SiO2)
sedimentary
Chert (Flint)
Microcrystalline Quartz (SiO2)
sedimentary