Sandstone Concretion
Sedimentary Concretion (Quartz sandstone with iron oxide cement)
sedimentary
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Quartz Vein in Host Rock (Pebble)
Quartz (SiO2) with sandstone or siltstone matrix
metamorphic/igneous transition
Sandstone
Arenite
sedimentary
Fossil Shark Tooth
Selachii (fossilized dentition)
fossil
Malachite-Bearing Copper Ore
Cu2CO3(OH)2 (Malachite) in host rock
mineral
Slate
Slate (foliated metamorphic rock)
metamorphic
Pink Granite
Phaneritic Felsic Igneous Rock (composed primarily of K-feldspar, Quartz, and Biotite)
igneous
Sandstone (Quartzose)
Arenite (Siliciclastic sedimentary rock)
sedimentary
Sandstone Cobble
Arenite (primarily Quartz Arenite)
sedimentary
Desert Rose
Gypsum (variety Selenite) or Barite, CaSO4·2H2O
mineral
Pale blue-gray quartz-rich pebble (tentative)
Quartz, SiO₂, possibly chalcedony or a weathered metamorphic fragment
mineral
Quartz-bearing iron-stained breccia
Brecciated quartz/quartzite with iron oxides, chiefly SiO₂ with hematite/goethite and possible feldspar or host-rock fragments
mineral
Diorite
Diorite (intermediate intrusive igneous rock)
igneous
Epidote with Quartz/Feldspar
Epidote (Ca2(Al, Fe)3(SiO4)3(OH)) with associated minerals in a host rock
Mineral/Metamorphic rock
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
Arenite (primarily SiO2)
sedimentary
Vesicular Basalt
Basalt with secondary mineral infilling (Amygdaloidal Basalt)
igneous
Hypersthene
Hypersthene (formula: (Mg,Fe)SiO3)
mineral
Basalt
Basalt (Mafic Extrusive Igneous Rock)
igneous
Sandstone (with Iron Oxide)
Quartz Arenite / Ferruginous Sandstone (SiO2 with Fe2O3)
sedimentary
Quartz (Rock Crystal)
Silicon Dioxide (SiO2)
mineral
Turquoise
Hydrous phosphate of copper and aluminium (CuAl6(PO4)4(OH)8·4H2O)
gemstone
Quartz Vein
Silicon Dioxide (SiO2)
Mineral
Granite
Intrusive Igneous Rock
igneous
Basalt
Extrusive igneous rock
igneous
Granite
Intrusive Igneous Rock
igneous
Basalt Breccia
Volcanic Breccia (composed of basaltic clasts in a fine-grained matrix)
igneous
Rose Quartz
Silicon Dioxide (SiO2)
mineral
Pyrite Nodule
Iron Sulfide (FeS2)
mineral
Chalcedony
Silicon Dioxide (SiO2)
mineral
Petrified Wood
Silicified Wood (primarily Chalcedony/Quartz, SiO2)
fossil
Amethyst (Chevron Amethyst)
Amethystine Quartz (SiO2)
mineral
Granite Sand (Decomposed Granite)
Grus / Quartz-Feldspar Detritus
sedimentary
Geode
Silicon dioxide (Quartz/Chalcedony) concretion
sedimentary
Vesicular Basalt (or Scoria)
Vesicular Basalt
igneous
Limonite (Ironstone Concretion)
Limonite (FeO(OH)·nH2O)
sedimentary
Red Sandstone
Arenite (with Iron Oxide cement)
sedimentary
Quartz Vein in Host Rock (Gneiss/Schist)
Silicon Dioxide (SiO2) within a metamorphic matrix
metamorphic
Granite
Granite (Phaneritic igneous rock)
igneous
Iron Slag
Anthropogenic Ferro-silicate
mineral