Banded Sandstone
Clastic Sedimentary Rock (Quartz Arenite)
sedimentary
Category
Synthetic (Not A Rock Or Mineral)
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Granite Pebble
Intrusive Igneous Rock
igneous
Amygdaloidal Basalt
Amygdaloidal Basalt (Mafic Volcanic Rock)
Igneous
Shale
Shale (clastic sedimentary rock)
sedimentary
Limonite (Ironstone)
Hydrated Iron(III) Oxide-hydroxide (FeO(OH)·nH2O)
sedimentary
Sandstone (Iron-stained)
Sandstone (rich in Quartz and Hematite/Limonite coatings)
sedimentary
Granite
Felsic intrusive igneous rock
igneous
Quartz Vein in Host Rock (Gabbro or Basalt)
Silicon Dioxide (SiO2) with Mafic Silicates
metamorphic/igneous
Limonite Concretion (Ironstone)
Limonite (FeO(OH)·nH2O) / Goethite
sedimentary
Sandstone (Ferruginous)
Arenite (composed primarily of SiO2 with Fe2O3 staining)
sedimentary
Granite
Intrusive Igneous Rock
igneous
Granite
Felsic intrusive igneous rock
igneous
Granite
Felsic intrusive igneous rock
igneous
Granite
Intrusive Igneous Rock
igneous
Quartz Geode
Silicon Dioxide (SiO2)
mineral
Sandstone Concretion
Sedimentary Concretion (Quartz sandstone with iron oxide cement)
sedimentary
Quartz Vein in Host Rock (Pebble)
Quartz (SiO2) with sandstone or siltstone matrix
metamorphic/igneous transition
Milky Quartz Nodule / Geode precursor
Silicon Dioxide (SiO2)
mineral
Sandstone
Arenite
sedimentary
Tumbled Mineral Collection (Amethyst, Celestite, K2 Jasper, Rose Quartz, Ruby in Zoisite, Que Sera Stone)
Mixed Mineral Specimens (Quartz SiO2, Celestite SrSO4, Corundum Al2O3 with Zoisite, etc.)
mineral
Porphyritic Igneous Pebble / Porphyry
Porphyritic Igneous Rock
igneous
Hag Stone
Perforated sedimentary rock (typically flint, chert, or limestone)
sedimentary
Epidote with Quartz/Feldspar
Epidote (Ca2(Al, Fe)3(SiO4)3(OH)) with associated minerals in a host rock
Mineral/Metamorphic rock
Quartz Pebble
Silicon Dioxide (SiO2)
mineral
Quartz (Iron-Stained)
Silicon Dioxide (SiO2)
mineral
Amethyst
Silicon Dioxide (SiO2) with iron impurities
mineral
Milky Quartz with Pyrite and Iron Staining
Silicon Dioxide (SiO2) with Iron Disulfide (FeS2) inclusions
mineral
Bicolor Quartz Pebble
Silicon Dioxide (SiO2) with mineral inclusions
mineral
Sandstone (Quartzose)
Arenite (primarily SiO2)
sedimentary
Sandstone (likely Arkosic or Lithic Sandstone)
Arenite (SiO2 based with mineral inclusions)
sedimentary
Sandstone
Arenite (primarily SiO2)
sedimentary
Hypersthene
Hypersthene (formula: (Mg,Fe)SiO3)
mineral
Granite
Intrusive igneous felsic rock
igneous
Turquoise
Hydrous phosphate of copper and aluminium (CuAl6(PO4)4(OH)8·4H2O)
gemstone
Quartz Vein
Silicon Dioxide (SiO2)
Mineral
Granite
Intrusive igneous rock composed mainly of quartz, alkali feldspar, and plagioclase
igneous
Granite
Phaneritic Felsic Intrusive Igneous Rock
igneous
Sandstone (Ferruginous)
Arenite (with Iron Oxide cement)
sedimentary
Granite Sand (Decomposed Granite)
Grus / Quartz-Feldspar Detritus
sedimentary
Geode
Silicon dioxide (Quartz/Chalcedony) concretion
sedimentary
Granite-like igneous rock
Likely medium-grained granite or granodiorite; quartz–feldspar–mica aggregate
igneous
Limonite (Ironstone Concretion)
Limonite (FeO(OH)·nH2O)
sedimentary