Quartz Geode (partially opened)
Silicon Dioxide (SiO2) with iron staining
mineral
Category
Sedimentary Or Igneous (Secondary Formation)
Browse sedimentary or igneous (secondary formation) specimens identified by the Rock Identifier community.
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Ferruginous Quartz
Silicon Dioxide with Hematite/Limonite inclusions (SiO2 + Fe2O3)
mineral
Milky Quartz
Quartz (Silicon Dioxide, SiO2)
mineral
Unidentified gray-brown stone
Likely fine-grained quartz–feldspar rock; exact identification is not possible from this close, blurred image
mineral
Feldspar (specifically Orthoclase or Plagioclase)
Potassium Aluminum Silicate (KAlSi3O8) or Sodium/Calcium Aluminum Silicate
mineral
Unidentifiable Rock Fragment
Uncertain
Quartz Geode
Crystalline Silicon Dioxide (SiO2) in Geode form
mineral
Rhodonite
Manganese Silicate (Mn,Fe,Mg,Ca)SiO3
mineral
Chert (Jasper variation)
Microcrystalline Quartz (SiO2)
sedimentary
Quartz Vein in Schist
Quartz-rich Micaceous Schist (SiO2 + phyllosilicates)
metamorphic
Chert (with Quartz Veining)
Microcrystalline silicon dioxide (SiO2)
sedimentary
Hematite / Goethite (Iron Ore)
Iron Oxide (Fe2O3 / FeO(OH))
mineral
Rhodochrosite
Manganese carbonate (MnCO3)
mineral
Quartz
Silicon Dioxide (SiO2)
mineral
Botryoidal Hematite (Kidney Ore)
Hematite (Fe2O3)
mineral
Calcite (commonly referred to as Orange Calcite or Honey Calcite given its color)
Calcite
Mineral
Quartz
Silicon Dioxide (SiO2)
Mineral
Healer's Gold (Pyrite and Magnetite in Schist)
Magnetite (Fe3O4) and Pyrite (FeS2) in Mica Schist
metamorphic
Blue Chalcedony
Silicon Dioxide (SiO2)
mineral
Mixed mineral and rock collection
Predominantly quartz varieties, including amethyst, plus likely calcite, feldspar, mica, and miscellaneous polished stones
mineral
Milky Quartz
SiO2 (Silicon Dioxide)
mineral
Amazonite
Amazonite (KAlSi3O8 – a variety of Microcline, a Potassium Feldspar)
mineral
Milky Quartz with Iron Staining
Silicon Dioxide (SiO2)
mineral
Agate (specifically Chalcedony/Banded Agate)
Silicon Dioxide (SiO2)
sedimentary
Magnetite (Lodestone)
Iron(II,III) oxide (Fe3O4)
mineral
Tumbled Agate
Silicon Dioxide (SiO2)
mineral
Agate (specifically, a slice of a Blue Lace or Chalcedony Agate nodule)
Silicon Dioxide (SiO2) - Cryptocrystalline Quartz
mineral
Banded Chert or Agate
Silicon Dioxide (SiO2)
sedimentary
Pink Granite
Phaneritic Felsic Igneous Rock (high K-feldspar)
igneous
Citrine and Quartz
Silicon Dioxide (SiO2)
mineral
Yellow Calcite
Calcium Carbonate (CaCO3)
mineral
Yellow Quartz (Citrine/Yellow Jasper)
Silicon Dioxide (SiO2)
mineral
Calcite
Calcium Carbonate (CaCO3)
mineral
Fluorite
Calcium Fluoride (CaF2)
mineral
Hematite (Nodular or Botryoidal)
Iron(III) oxide (Fe2O3)
mineral
Dalmation Jasper (or Dalmation Stone)
Dalmation Stone (composed of Perthite, Quartz, and Arfvedsonite)
igneous
Blue Calcite
Calcium Carbonate (CaCO3)
mineral
Quartzite with Quartz Vein
Quartzite (SiO2)
metamorphic
Prehnite
Prehnite (Ca2Al2Si3O10(OH)2)
mineral
Jasper Agate
Chalcedony (Silicon Dioxide - SiO2)
mineral
Agate Nodule (partially vuggy Quartz)
Silicon Dioxide (SiO2)
Mineral/Sedimentary
Sandstone
Arenite (primary component SiO2)
sedimentary