Blue Calcite
Calcium Carbonate (CaCO3)
mineral
Category
Sedimentary (Secondary Mineral) Within Igneous
Browse sedimentary (secondary mineral) within igneous specimens identified by the Rock Identifier community.
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Bloodstone (Heliotrope)
Silicon Dioxide (SiO2) with inclusions of Chlorite or Actinolite
sedimentary
Amethyst and Calcite collection
Silicon Dioxide (SiO2) and Calcium Carbonate (CaCO3)
mineral
Prehnite
Prehnite (Ca2Al2Si3O10(OH)2)
mineral
Chalcedony (Agate Nodule)
Silicon Dioxide (SiO2)
mineral
Turquoise in Matrix
Hydrous phosphate of copper and aluminium, CuAl6(PO4)4(OH)8·4H2O
mineral
Pyrite Cube in Matrix
Iron Sulfide (FeS2)
mineral
Green Calcite
Calcium Carbonate (CaCO3)
mineral
Chert (River Pebble)
Cryptocrystalline Quartz (SiO2)
sedimentary
Weathered iron-rich rock (likely ironstone or altered basalt)
Probable limonite/goethite-bearing basalt or ironstone; exact identification requires testing
igneous
Banded Chert (Agate/Jasper blend)
Microcrystalline Quartz (SiO2)
sedimentary
Limonite / Ironstone
Limonite (Hydrated Iron Oxide) - FeO(OH)·nH2O
mineral
Massive White Quartz
Silicon Dioxide (SiO2)
mineral
Variscite (in Matrix)
Hydrated aluminum phosphate (AlPO4·2H2O)
mineral
Vesicular basalt (lava rock)
Vesicular basalt, composed mainly of plagioclase, pyroxene, and often olivine
igneous
Gneiss
Gneiss (Metamorphic Rock)
metamorphic
Chert (Pebble)
Microcrystalline to Cryptocrystalline Quartz (SiO2)
sedimentary
Chert (Jasper influence)
Microcrystalline Quartz (SiO2)
sedimentary
Limonite stained Sandstone
Sedimentary rock with Goethite/Limonite (FeO(OH)·nH2O)
sedimentary
Jasper with Quartz Veining
Microcrystalline quartz (SiO2) with iron oxide impurities
sedimentary
Polished volcanic scoria or vesicular basalt
Vesicular basalt; primarily plagioclase, pyroxene, and iron-rich glass/oxides
igneous
Pyrite (Fools Gold)
Iron Disulfide (FeS2)
mineral
Ocean Jasper
Orbicular Jasper (Silicon Dioxide, SiO2)
sedimentary
Fluorite
Calcium Fluoride (CaF2)
mineral
Banded Agate
Cryptocrystalline Quartz (SiO2)
sedimentary
Vesicular basalt (possibly scoriaceous basalt)
Basalt, chiefly plagioclase feldspar, clinopyroxene, and iron-titanium oxides
igneous
Chert / Flint
Chert (varietal name for microcrystalline quartz). Chemical formula: SiO₂
Mineral
Blue Calcite
Calcium Carbonate (CaCO3)
mineral
Hematite
Iron(III) oxide (Fe2O3)
mineral
Jasper (or possibly Agate/Chalcedony) beads
SiO2 (Silicon Dioxide)
mineral
Blue and White Quartz
Crystalline Silicon Dioxide with inclusions (SiO2)
mineral
Fossiliferous Limestone
Sedimentary Calcium Carbonate (CaCO3) Matrix with Fossil Fragments
fossil
Red Jasper (possibly with Quartz or Hematite)
Silicon Dioxide (SiO2) with iron oxide impurities
sedimentary or metamorphic
Malachite and Azurite on Gossan (Ironstone Matrix)
Cu2CO3(OH)2 (Malachite) on FeO(OH)·nH2O (Limonite/Gossan)
mineral
Turquoise in Matrix
Hydrated phosphate of copper and aluminium: CuAl6(PO4)4(OH)8·4H2O
mineral
Milky Quartz
Silicon Dioxide (SiO2)
mineral
Quartz Crystal (Geode Fragment)
Silicon Dioxide (SiO2)
mineral
Carnelian Agate
Silicon Dioxide (SiO2) with Iron Oxide inclusions
mineral
Agate (Carnelian / Chalcedony)
Silicon Dioxide (SiO2) - Microcrystalline Quartz
mineral
Quartz (or Chalcedony) Specimen
Silicon Dioxide (SiO2)
mineral
Chalcedony (Agate/Carnelian)
Silicon Dioxide (SiO2)
mineral
Blue Chalcedony
Silicon Dioxide (SiO2)
mineral