Sandstone
Arenite (SiO2 based)
sedimentary
Category
The Purple Specimen Is A Mineral (Amethyst); The White Specimen Is A Sedimentary Rock (Limestone Or Marble).
Browse the purple specimen is a mineral (amethyst); the white specimen is a sedimentary rock (limestone or marble). specimens identified by the Rock Identifier community.
Jasper (Red Jasper with Quartz veins)
Jasper (Silicon Dioxide, SiO2)
sedimentary
Fluorite
Calcium Fluoride (CaF2)
mineral
Chert (Iron-stained)
Microcrystalline Quartz (SiO2)
sedimentary
Amethyst (Tumbled)
Amethyst (Silicon Dioxide with Iron impurities) - SiO2
mineral
Quartz Geode with Calcite
Silicon Dioxide (SiO2) and Calcium Carbonate (CaCO3)
Mineral/Geode
Gneiss (Metamorphic Rock)
Gneiss (variable mineral formula primarily containing Quartz, Feldspar, and Mica)
metamorphic
Fluorite (Green Fluorite)
Fluorite (Calcium Fluoride, CaF2)
mineral
Chert (specifically Flint or Common Chert)
Silicon Dioxide (SiO2)
sedimentary
Chert (Jasper/Flint variety)
Silicon Dioxide (SiO2)
sedimentary
Chert (White Variety)
Silicon Dioxide (SiO2)
sedimentary
Sandstone (likely Siltstone)
Arenite or Siltstone (high SiO2 content)
sedimentary
Sandstone (Ferruginous)
Arenite (primarily SiO2 with Fe2O3 staining)
sedimentary
Quartz Pebble (Geode-like)
Silicon Dioxide (SiO2)
Mineral
Amethyst (Chevron/Dream Amethyst)
Silicon Dioxide (SiO2) with iron impurities
mineral
Amethyst Geode
Amethyst (Silicon Dioxide), Formula: SiO2
mineral
Chert Nodules (with Gryphaea or Shell inclusions)
Microcrystalline Quartz (SiO2) with Calcitic inclusions
sedimentary
Sandstone (Ferruginous)
Arenite (Fe-rich)
sedimentary
Amethyst Quartz
Silicon Dioxide (SiO2 with iron impurities)
mineral
Quartz (likely)
Quartz (SiO2 - Silicon Dioxide)
Mineral
Limonite-stained Quartz
Silicon Dioxide (SiO2) with Iron Oxide/Hydroxide (FeO(OH)·nH2O) staining
mineral
Druzy Quartz on Limestone
Silicon Dioxide (SiO2)
mineral
Jasper
Jasper (Silicon Dioxide, SiO2)
sedimentary
Sandstone (Stream-rounded Cobble)
Arenite (composed primarily of SiO2, Silica)
sedimentary
Banded Gneiss
Gneiss (Metamorphic Rock)
metamorphic
Sandstone (likely Quartzose Sandstone)
Arenite (composed primarily of SiO2)
sedimentary
Sandstone
Clastic sedimentary rock (primarily SiO2)
sedimentary
Orange Calcite
Calcium Carbonate (CaCO3)
mineral
Chert (Flint Pebbles)
Microcrystalline or Cryptocrystalline Quartz (SiO2)
sedimentary
Emerald In Matrix
Beryl (Be3Al2Si6O18) with Chromium/Vanadium impurities
mineral
Septarian Nodule (Dragon Stone)
Septarian Nodule (Calcium Carbonate/Aragonite/Calcite Concretion)
sedimentary
Jasper and Quartz River Cobble
Silicon Dioxide (SiO2) with Hematite inclusions
Sedimentary / Metamorphic
Chert (Yellow Jasper variant)
Microcrystalline Quartz (SiO2)
sedimentary
Chert (Beach Pebble)
Silicon Dioxide (SiO2)
sedimentary
Sandstone (with Iron Staining)
Clastic sedimentary rock (primarily SiO2 with Fe2O3 staining)
sedimentary
Gneiss (with Quartz-Feldspar vein)
Gneiss (high-grade metamorphic rock) containing Quartz (SiO2) and Feldspar (KAlSi3O8 – NaAlSi3O8 – CaAl2Si2O8)
metamorphic
Chert (with Quartz Vein)
Microcrystalline silica (SiO2)
sedimentary
Fossiliferous Limestone with Rugose Coral
Calcite (CaCO3) matrix containing Rugosa (order of extinct solitary and colonial corals)
sedimentary
Sandstone
Arenite (primarily SiO2)
sedimentary
Lapis Lazuli
Lapis Lazuli (Complex silicate rock containing Lazurite (Na,Ca)8(AlSiO4)6(S,Cl,SO4,OH)2, Pyrite, and Calcite)
metamorphic
Map Jasper (Grey Picasso Jasper)
Silicon Dioxide (SiO2) with impurities
sedimentary
Limestone
Calcareous Sedimentary Rock (CaCO3)
sedimentary