Sandstone (Quartzose Sandstone)
Clastic sedimentary rock (primarily SiO2)
sedimentary
Category
Mineral Like Biological Tissue
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Olivine (Peridot)
(Mg,Fe)2SiO4
mineral
Amygdaloidal Basalt with Epidote
Vesicular Basalt with secondary Epidote/Quartz mineral infill
igneous
Sandstone
Clastic Sedimentary Rock
sedimentary
Mica Schist
Mica Schist (Quartz-Biotite-Muscovite Schist)
metamorphic
Brown Garnet
Andradite or Almandine Garnet (general formula X3Y2(SiO4)3)
mineral
Sandstone
Arenite
sedimentary
Quartz Druzy (on Matrix)
Silicon Dioxide (SiO2)
mineral
Quartz (Milky / Clear Quartz Fragment)
Silicon Dioxide (SiO2)
mineral
Satin Spar Gypsum (Satin Spar Selenite)
Hydrous calcium sulfate (CaSO4%C2%A02H2O)
mineral
Stalagmite (Flowstone)
Speleothem (Calcium Carbonate, CaCO3)
sedimentary
Quartz with Iron Stains
Silicon Dioxide (SiO2) with FeOx inclusions
mineral
Sandstone
Arenite (SiO2 dominant)
sedimentary
Banded Chert / Cryptocrystalline Quartz
Silicon Dioxide (SiO2)
sedimentary
Botryoidal Quartz Cluster (Druzy Stalactitic Quartz)
Silicon Dioxide (SiO2)
mineral
Hematite
Hematite (Iron(III) oxide, Fe2O3)
mineral
Ironstone Concretion
Ferruginous Concretion
sedimentary
Pink Opal
Hydrated Silica (SiO2·nH2O) with Palygorskite/Sepiolite inclusions
gemstone
Gneiss (Metamorphic Rock)
Gneiss
metamorphic
Fossil Shark Tooth
Chondrichthyes (Class)
fossil
Quartz Geode
Silicon Dioxide (SiO2)
mineral
Sandstone
Sedimentary Rock (Quartz Sandstone)
sedimentary
Agate Geode Nodule
Chalcedony / Quartz (SiO2)
mineral
Sunstone
Oligoclase (a plagioclase feldspar variant), (Na,Ca)(Al,Si)4O8
mineral
Amethyst (Rose de France)
Silicon Dioxide (SiO2) with iron impurities
mineral
Schist
Mica Schist
metamorphic
Pink Granite
Felsic intrusive igneous rock (composition: SiO2 and Al2O3)
igneous
Diorite (River Rock/Cobble)
Intermediate Plutonic Igneous Rock (Diorite)
igneous
Sandstone
Sedimentary Rock (Quartz Sandstone)
sedimentary
Black Beach Pebble (Basalt / Slate Pebble)
Rounded Fine-Grained Clastic / Igneous Rock Pebble
sedimentary
Blue Celestine
Celestine (SrSO4)
mineral
Quartz Geode/Vug in Host Rock
SiO2 (Silicon Dioxide) in various host rocks
mineral
Rose Quartz
Silicon Dioxide (SiO2) with trace amounts of titanium, iron, or manganese
mineral
Labradorite
Plagioclase Feldspar (Na,Ca)(Al,Si)4O8
mineral
Hematite
Hematite (Fe2O3)
mineral
Red Jasper Cube
SiO2 (microcrystalline quartz)
mineral
Iron-stained Quartz
Silicon Dioxide (SiO2) with Hematite/Limonite inclusions
mineral
Carnelian (Tumbled)
Silicon Dioxide (SiO2)
mineral
Tumbled Fluorite
Fluorite (Calcium Fluoride, CaF2)
mineral
Amethyst
Silicon Dioxide (SiO2) with iron impurities
mineral
Quartz (Milky/Smoky mix)
Silicon Dioxide (SiO2)
mineral
Pyrite
Iron Pyrite (FeS2)
mineral