Sandstone (Quartzite-rich)
Clastic Sedimentary Rock (primarily SiO2)
sedimentary
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Black Sand (Magnetite Sand)
Magnetite-rich Placers (Fe3O4)
sedimentary
Dalmatian Stone
Dalmatian Jasper (Aphanitic Igneous Rock with Arfvedsonite inclusions)
igneous
Gneiss
High-grade metamorphic rock (Gneiss)
metamorphic
Granite
Granite (a plutonic igneous rock composed of quartz, feldspar, and mica)
igneous
Diorite (possibly fine-grained variety or a related intermediate intrusive rock like a felsic gabbro or a dark granodiorite)
Diorite (Igneous rock, intrusive, intermediate composition)
Igneous Rock
Rose Quartz
Silicon Dioxide (SiO2)
mineral
Amethyst on Agate/Basalt Matrix
Silicon Dioxide (SiO2) with iron impurities
mineral
Amethyst
Silicon Dioxide (SiO2) with iron impurities
mineral
Quartz Pebble
Quartz (Silicon Dioxide - SiO2)
mineral
Milky Quartz
Quartz (Silicon Dioxide, SiO2)
mineral
Milky Quartz
Quartz (Silicon Dioxide, SiO2)
mineral
Almandine Garnet
Almandine (Fe3Al2Si3O12)
mineral
Diamond
Diamond (Pure Carbon, C)
mineral
Hematite
Iron(III) oxide (Fe2O3)
mineral
Shale or Argillite
Shale (sedimentary) / Argillite (metamorphic)
Sedimentary or Metamorphic (low-grade)
Granite Pebble (Salt and Pepper Granite)
Felsic Intrusive Igneous Rock (Granite)
igneous
Granite
Granite (Phaneritic Acidic Igneous Rock)
igneous
Granite (specifically Pink or Alkali Feldspar Granite)
Felsic Plutonic Rock (primarily SiO2 with KAlSi3O8)
igneous
Quartz Pebble
Silicon Dioxide (SiO2)
mineral
Basalt (Vesicular)
Basalt (Mafic Extrusive Igneous Rock)
igneous
Sandstone
Arenite (composed primarily of SiO2)
sedimentary
Sandstone (Green/Yellow Siltstone variant)
Arenite or Siltstone (primarily SiO2 with mineral staining)
sedimentary
Basalt with Quartz Vein
Aphanitic Mafic Igneous Rock with Silicon Dioxide (SiO2) intrusion
igneous
Aventurine
Quartzite with inclusions (SiO2 containing Fuchsite chrome mica)
metamorphic
Agate
Silicon Dioxide (SiO2)
mineral
Red Sandstone
Sandstone (mainly SiO2 with Iron Oxide cement)
sedimentary
Sandstone
Clastic Sedimentary Rock (composed primarily of Quartz: SiO2)
sedimentary
Sandstone (Ferruginous)
Clastic Sedimentary Rock (primarily SiO2 with Fe2O3 staining)
sedimentary
Sandstone
Arenite (composed primarily of SiO2)
sedimentary
Rock salt (Halite)
Halite (Sodium Chloride, NaCl)
sedimentary
Banded Gneiss
Gneiss (High-grade Regional Metamorphic Rock)
metamorphic
Blue Sapphire
Corundum (Al2O3 with iron and titanium trace elements)
mineral
Pink Feldspar
Orthoclase Feldspar (KAlSi3O8)
mineral
Amygdaloidal Basalt
Basalt with secondary mineral infilling (commonly Zeolite, Calcite, or Quartz)
igneous
Vesicular Basalt (Iron-Stained)
Mafic Volcanic Rock (Basalt)
igneous
Granite
Phaneritic Igneous Rock (Granite)
igneous
Gneiss
Gneiss (quartz-feldspar-biotite gneiss)
metamorphic
Gneiss
Metamorphic rock of high-grade regional metamorphism
metamorphic
White Quartz (Milky Quartz)
Silicon Dioxide (SiO2)
mineral
Gold
Native Gold (Au)
Mineral
Emerald in Matrix
Beryl (Be3Al2Si6O18) containing Chromium/Vanadium impurities
mineral