Ferruginous Quartz
Silicon Dioxide (SiO2) with Hematite/Limonite impurities
mineral
Category
Sedimentary (Secondary Mineral Formation)
Browse sedimentary (secondary mineral formation) specimens identified by the Rock Identifier community.
Rose Quartz
Silicon Dioxide (SiO2) with trace amounts of titanium, iron, or manganese
mineral
Chert (Iron-stained)
Chert (SiO2 - Silicon Dioxide)
sedimentary
Coquina
Biogenic Limestone (Calcite/Aragonite)
sedimentary
Red Chert (Jasper)
Silicon Dioxide (SiO2)
sedimentary
Red Jasper
Jasper (Silicon Dioxide, SiO2)
sedimentary
Granite
Granite (Felsic Plutonic Rock)
igneous
Quartzite
Quartzite (primarily SiO2)
metamorphic
Serpentinite
Serpentinite (composed primarily of minerals in the Serpentine group: Chrysotile, Lizardite, and Antigorite)
metamorphic
Banded Iron Formation (BIF) / Iron Ore
Hematite-Magnetite BIF (Fe2O3 / Fe3O4 mixed with SiO2)
sedimentary
Rose Quartz
Silicon Dioxide (SiO2) with traces of titanium, iron, or manganese
mineral
Prehnite
Prehnite (Ca2Al(AlSi3O10)(OH)2)
Mineral
Rose Quartz
Rose Quartz (SiO2)
mineral
Granite
Phaneritic plutonic rock (Quartz, Alkali Feldspar, and Plagioclase)
igneous
Desert Rose (Baryte/Gypsum Rosette)
Baryte (BaSO4) or Gypsum (CaSO4·2H2O)
mineral
Red Jasper
Jasper (Silicon Dioxide with Iron Oxide impurities), SiO2
sedimentary
Jasper (Green variety)
Silicon Dioxide (SiO₂)
sedimentary
Red Jasper
Silicon Dioxide (SiO2) with Hematite inclusions
sedimentary
Red Jasper
Silicon Dioxide (SiO2) with Hematite (Fe2O3) inclusions
sedimentary
Chert / Flint
Cryptocrystalline quartz (SiO2)
sedimentary
Rose Quartz
Quartz (SiO2) with trace impurities causing pink color
Mineral
Yellow Chalcedony
Chalcedony (a cryptocrystalline variety of Quartz, SiO₂)
Mineral
Pebble or Cobble (likely composed of sandstone or conglomerate)
Clastic Sedimentary Rock (specific name like sandstone, conglomerate, or breccia would require microscopic analysis of clast size and angularity)
Sedimentary Rock (possibly a conglomerate or coarse-grained sandstone)
Cobaltian Calcite (Cobaltoan Calcite)
Cobalt-bearing Calcite (Ca,Co)CO3
mineral
Vesicular Basalt with Quartz/Chalcedony
Vesicular Basalt (primarily Plagioclase, Pyroxene, and Olivine with SiO2 infill)
igneous
Ferruginous Quartz (Iron-stained Quartz)
Silicon Dioxide (SiO2) with Hematite/Limonite impurities
mineral
Granite
Granite (felsic intrusive igneous rock)
igneous
Chert (Jasper or Flint variant)
Chert (composed of microcrystalline quartz, SiO2)
sedimentary
Crushed Limestone
Calcium Carbonate (CaCO3)
Sedimentary
Carnelian
Carnelian (a variety of Chalcedony, SiO2)
Mineral
Ruby in Kyanite
Corundum (Al2O3) in Kyanite (Al2SiO5)
metamorphic
Lapis Lazuli
Lapis Lazuli (a rock composed primarily of Lazurite (Na,Ca)8(AlSiO4)6(S,SO4,Cl)1-2, with varying amounts of Calcite, Pyrite, and Sodalite).
Mineral
Dragon Vein Agate
Silicon Dioxide (SiO2)
mineral
Garnet (Pyrope-Almandine series)
Garnet Group, (Mg,Fe)3Al2Si3O12
mineral
Rose Quartz
Quartz (Silicon Dioxide - SiO2)
mineral
Limonite-stained Quartzite
Quartzite with Limonite (FeO(OH)·nH2O) staining
metamorphic
Quartzite Pebble
Metamorphosed Quartz Sandstone (SiO2)
metamorphic
Rutilated Quartz
Quartz (SiO2) with Rutile (TiO2) inclusions
Mineral
Banded Agate (Pink/White)
Silicon Dioxide (SiO2) - Variety of Chalcedony
mineral
Banded Agate (specifically Sardonyx)
Silicon Dioxide (SiO2) - variety of Chalcedony/Quartz
mineral
Rose Quartz
Silicon Dioxide (SiO2) with trace amounts of Titanium, Iron, or Manganese
mineral
Red Tiger's Eye
SiO2 (Silicon Dioxide with iron inclusions)
mineral