Basalt with Quartz Veining
Amygdaloidal Basalt (predominately SiO2 and (Na,Ca)(Si,Al)4O8)
igneous
Category
Mineral Side Rock
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Granite
Granite (Felsic Plutonic Rock)
igneous
Conglomerate
Conglomerate
sedimentary
Aventurine
Quartzite with inclusions (SiO2 containing Fuchsite chrome mica)
metamorphic
Obsidian
Volcanic Glass (Amorphous Silica)
igneous
Granite Glacial Erratic
Intrusive Phaneritic Felsic Rock (Granite)
igneous
Red Sandstone
Arenite (predominantly SiO2 with Fe2O3)
sedimentary
Amygdaloidal Basalt
Amygdaloidal Basalt (extrusive volcanic rock)
Igneous
Emerald with Matrix (Emerald in Mica Schist)
Beryl (Be3Al2Si6O18) with Chromium/Vanadium impurities
mineral
Greenstone / River Jadeite pebble
Metavolcanic rock / Chlorite or Actinolite-rich schist
metamorphic
Basalt
Basalt (Mafic Extrusive Igneous Rock)
igneous
Gneiss
Gneiss (High-grade regional metamorphic rock)
metamorphic
Milky Quartz Pebble
Quartz (Silicon Dioxide, SiO2)
mineral
Amygdaloidal Basalt
Amygdaloidal Basalt (Mafic volcanic rock)
igneous
Dalmatian Jasper
Peralkaline rhyolite with Arfvedsonite inclusions
igneous
Garnetiferous Quartzite (Garnet Gneiss Pebble)
Garnet-bearing Quartzite or Quartz-Feldspar Gneiss
metamorphic
Granite (Weathered River Rock)
Granite (Phaneritic Igneous Rock)
igneous
Granite
Plutonic felsic igneous rock
igneous
Basalt with Olivine (Peridot)
Basalt containing (Mg,Fe)2SiO4
igneous
Gneiss (Metamorphic Rock)
Gneiss
metamorphic
Emerald in Matrix (Quartz/Calcite)
Beryl (Be3Al2Si6O18) with Chromium/Vanadium impurities
mineral
Clear Quartz Cluster
Silicon Dioxide (SiO2)
mineral
Vesicular Basalt
Mafic Volcanic Rock (Basalt)
igneous
Milky Quartz
Quartz (Silicon Dioxide - SiO2)
mineral
Quartz Pebble
Silicon Dioxide (SiO2)
mineral
Tree Agate (or Moss Agate)
Dendritic Agate (Silicon Dioxide - SiO2)
mineral
Chlorastrolite (Greenstone)
Chlorastrolite (variety of Pumpellyite) - Ca2(Mg,Fe)Al2(SiO4)(Si2O7)(OH)2 · H2O
mineral
Basalt with Epidote Veins
Mafic Igneous Rock (Basalt)
igneous
Quartz (Milky/Common)
Silicon Dioxide (SiO2)
mineral
Dyed Blue Agate Slice
Silicon Dioxide (SiO2) with artificial dye
mineral
Chevron Amethyst
Silicon Dioxide (SiO2) with iron impurities and white quartz bands
mineral
Quartzite
Quartzite (primarily SiO2)
metamorphic
Fossil Shell (Bivalve)
Class Bivalvia (Likely a member of the Ostreidae or Gryphaeidae family), CaCO3
sedimentary
Slate
Foliated Metamorphic Rock (composed primarily of Quartz, Muscovite, and Illite)
metamorphic
Quartz (specifically Quartzite or Massive Quartz)
Silicon Dioxide (SiO2)
Mineral
Green Jasper with Quartz veins
Jasper (Silicon Dioxide, SiO2)
sedimentary
Limestone
Calcium Carbonate (CaCO3)
sedimentary
Basalt with Caliche Crust
Aphanitic Mafic Igneous Rock with Calcium Carbonate (CaCO3) coating
igneous
Shale (with minor calcite veining)
Clastic sedimentary rock (primarily clay minerals and quartz)
sedimentary
Opalite
Synthetic Opalite Glass
mineraloid (man-made)
Red Quartzite (Strawberry Quartz)
Quartzite (SiO2 with iron oxide inclusions)
metamorphic
Dalmatian Stone
Dalmatian Jasper (Peralkaline Quartz-Feldspar Rock)
igneous