Zoisite with Ruby (Anyolite)
Zoisite – Ca2Al3(SiO4)3(OH) with inclusions of Ruby (Al2O3:Cr)
metamorphic
Category
Igneous Or Sedimentary (Water Worn)
Browse igneous or sedimentary (water worn) specimens identified by the Rock Identifier community.
Orange Calcite
Calcium Carbonate (CaCO3)
mineral
Clear Quartz
Silicon Dioxide (SiO2)
mineral
Chalcedony (Agate/Chert)
Silicon Dioxide (SiO2)
mineral
Clear Quartz
Silicon Dioxide (SiO2)
mineral
Quartz (Milky/Clear variety)
Silicon Dioxide (SiO2)
mineral
Clear Quartz (Rock Crystal)
Silicon Dioxide (SiO2)
mineral
Sandstone
Arenite (primarily SiO2)
sedimentary
Sandstone (with potential iron-oxide staining)
Arenite (primarily SiO2)
sedimentary
Septarian Nodule (Dragon Stone)
Septarian Concretion (CaCO3 + CaMg(CO3)2 + SiO2)
sedimentary
Jasper
Jasper (Silicon Dioxide, SiO2)
sedimentary
Jasper (Iron-stained Quartz)
Silicon Dioxide (SiO2) with iron oxide inclusions
sedimentary
Jasper with Agate Inclusions
Silicon Dioxide (SiO2)
sedimentary
White Onyx (Marble Onyx)
Calcite (CaCO3) - Banded Calcium Carbonate
sedimentary
Banded Jasper
Silicon Dioxide (SiO2) with iron oxide and clay impurities
sedimentary
Yellow Jasper
Silicon Dioxide (SiO2) with iron impurities
sedimentary
Chalcedony (Agate/Chert)
Microcrystalline Quartz (SiO2)
sedimentary
Limestone
Sedimentary Calcium Carbonate (CaCO3)
sedimentary
Jasper Agate
Chalcedony (Silicon Dioxide - SiO2)
mineral
Pyrite (Iron Pyrite) with Goethite Oxidation
Iron Sulfide (FeS2)
mineral
Orange Calcite
Calcite (Calcium Carbonate - CaCO3)
mineral
Banded River Rock / Gneiss (highly weathered)
Gneiss
Metamorphic rock
Sandstone (Ferruginous)
Arenite with Iron Oxide cement (SiO2 + Fe2O3)
sedimentary
Glauconite (Greensand)
(K, Na)(Fe3⁰, Al, Mg)₂(Si, Al)₄O₁₀(OH)₂
sedimentary
Dalmatian Stone (commonly called Dalmatian Jasper)
Peralkaline Rock (mixed Feldspar, Quartz, and Arfvedsonite)
igneous
Siltstone
Siltstone
sedimentary
Druzy Quartz on Chalcedony Matrix
Silicon Dioxide (SiO2)
mineral
Banded Sandstone
Arenite with Liesegang banding
sedimentary
Chert (Arrowhead Artifact)
Microcrystalline or cryptocrystalline Quartz (SiO2)
sedimentary
Amber
Succinite (specifically for Baltic amber); chemical formula approximately C10H16O
Mineraloid
Limestone
Sedimentary Calcium Carbonate (CaCO3)
sedimentary
Anthracite Coal
Anthracite (Carbon-based sedimentary-metamorphic rock)
metamorphic
Pyrite with Limonite/Goethite Alteration (Pseudomorph)
Iron Sulfide (FeS2) transitioning to Hydrated Iron Oxides (FeO(OH)·nH2O)
mineral
Banded Chert
Silicon Dioxide (SiO2)
sedimentary
Amazonite (Amazon Stone)
Tectosilicate Microcline (KAlSi3O8)
mineral
Amethyst
Amethyst (Silicon Dioxide - SiO2 with iron impurities)
mineral
Banded Chert
Microcrystalline Quartz (SiO2)
sedimentary
Chert (Iron-stained)
Microcrystalline or Cryptocrystalline Quartz (SiO2)
sedimentary
Brecciated Chert
Brecciated Chert (Microcrystalline Quartz, SiO2)
sedimentary
Moqui Marble (Concretion)
Iron Oxide Concretion (Hematite/Goethite)
sedimentary
Ferruginous Sandstone (Ironstone Nodules)
Ferruginous Quartz-Arenite (with Goethite/Hematite cement)
sedimentary
Chert (Smooth River Pebble)
Microcrystalline or Cryptocrystalline Quartz (SiO2)
sedimentary