Orange Calcite
Calcium Carbonate (CaCO3)
mineral
Category
Mineral, Specifically A Rock Fragment
Browse mineral, specifically a rock fragment specimens identified by the Rock Identifier community.
Specular Hematite (Specularite)
Hematite (Iron(III) oxide) - Fe2O3
mineral
Labradorite (Feldspar)
Labradorite: (Ca,Na)(Al,Si)4O8
mineral
Milky Quartz Pebble
Quartz (Silicon Dioxide, SiO2)
mineral
Yellow Jasper
Jasper (Silicon Dioxide, SiO2)
sedimentary
Amazonite
Potassium feldspar (Microcline) - K(AlSi3O8)
mineral
Agate (specifically Lake Superior Agate style or Banded Chalcedony)
Silicon Dioxide (SiO2) - Cryptocrystalline Quartz
mineral
Chert (specifically Yellow Jasper/Flint)
Microcrystalline Quartz (SiO2)
sedimentary
Limonite after Pyrite (Prophecy Stone)
Limonite (FeO(OH)·nH2O) replacing Pyrite (FeS2)
Mineral pseudomorph
Yellow Jasper
Silicon Dioxide (SiO2)
sedimentary
Fossil Shark Tooth (Otodus obliquus)
Otodus obliquus; hydroxyapatite (mineralized form Ca5(PO4)3(OH))
sedimentary (fossiliferous)
Labradorite
Labradorite (a variety of Plagioclase Feldspar), Na(AlSi3O8) to Ca(Al2Si2O8)
Mineral
Quartz
Silicon dioxide (SiO2)
mineral
Graywacke (River Cobble)
Graywacke (Lithic Sandstone)
sedimentary
Oolite (Ooid Limestone)
Ooidal Limestone (comprised of CaCO3)
sedimentary
Conglomerate
Clastic sedimentary rock (Polymictic Conglomerate)
sedimentary
Basalt with Weathered Rind
Basalt (Aphanitic Mafic Igneous Rock)
igneous
Oolitic Limestone
Oolitic Limestone (Calcium Carbonate, CaCO3)
sedimentary
Blue Chalcedony and Picture Jasper Beads
Blue Chalcedony (SiO2), Picture Jasper (SiO2)
Mineral
Granite
Phaneritic Plutonic Felsic Rock (primarily Quartz (SiO2), Alkali Feldspar, and Plagioclase Feldspar)
igneous
Shale or Argillite
Shale (sedimentary) / Argillite (metamorphic)
Sedimentary or Metamorphic (low-grade)
Citrine Quartz
Crystalline Silicon Dioxide (SiO2) with Ferric Iron impurities
mineral
Scoria (Lava Rock)
Scoria (Mafic Volcanic Rock)
igneous
Labradorite (specifically Larvikite beads)
Plagioclase Feldspar (Na,Ca)(Si,Al)4O8
igneous
Amethyst (specifically Chevron Amethyst or Dream Amethyst)
Silicon Dioxide (SiO2) with iron impurities
mineral
Imperial Jasper
Silicon Dioxide (SiO2) - Microcrystalline Quartz with Mineral Inclusions
Sedimentary
Yellow Jasper
Jasper (Silicon Dioxide, SiO2)
sedimentary
Orange Calcite
Calcium Carbonate (CaCO3)
mineral
Milky Quartz
Silicon Dioxide (SiO2)
mineral
Chert (Tripolitic Chert / Flint Nodules)
Microcrystalline Quartz (SiO2)
sedimentary
Mahogany Obsidian
Obsidian (Volcanic Glass with Hematite/Magnetite inclusions), SiO2
igneous
Arid Sandy Loam
Arenosols / Regosols
sedimentary
Green Calcite
Calcite (CaCO3)
mineral
Milky Quartz
Silicon Dioxide (SiO2)
mineral
Moss Agate
Chalcedony (Silicon Dioxide, SiO2) with dendritic inclusions
mineral
Blue Quartzite
Quartzite with inclusions (often Dumortierite or Magnesio-riebeckite), SiO2
metamorphic
Apache Tear
Hydrated Obsidian (Natural Volcanic Glass)
igneous
Amber
Succinite (specifically for Baltic Amber), Formula: C10H16O
Organic Gemstone (often associated with Sedimentary sequences)
Chert (specifically Flint or Jasper variant)
Chert (Siliceous rock composed of microcrystalline Quartz, SiO2)
sedimentary
Amazonite
Amazonite / Microcline (KAlSi3O8)
igneous
Milky Quartz
Silicon Dioxide (SiO2)
mineral
Orange Calcite
Calcium Carbonate (CaCO3)
mineral