Greenschist
Greenschist (chlorite-epidote schist)
metamorphic
Category
Igneous Rock
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Faceted Clear Quartz
Crystalline Silicon Dioxide (SiO2)
mineral
Basalt
Aphanitic mafic volcanic rock (primarily plagioclase feldspar and pyroxene)
igneous
Quartz Vein in Host Rock
Silicon Dioxide (SiO2) with host rock (often Schist or Basalt)
mineral
Quartzite River Pebble
Metamorphic Quartzite (SiO2)
metamorphic
Gneiss
Gneiss
metamorphic
Quartz / Common Agate
Silicon Dioxide (SiO2)
mineral
Quartz
Silicon Dioxide (SiO2)
mineral
Basalt
Mafic volcanic rock (formula mostly SiO2, MgO, FeO)
igneous
Porphyritic Basalt
Porphyritic Basalt (containing Plagioclase phenocrysts)
igneous
Gneiss
Gneiss (High-grade Metamorphic Rock)
metamorphic
Scoria (Lava Rock)
Scoria (Basaltic Scoria)
Igneous
Scoria (Lava Rock)
Vesicular Basalt / Scoria
igneous
Peach Moonstone
Orthoclase Feldspar ((K,Na)AlSi3O8) with inclusions
mineral
Carnelian
Carnelian (Cryptocrystalline Quartz, SiO2)
mineral
Milky Quartz
Silicon Dioxide (SiO2)
mineral
Muscovite Mica
Muscovite (KAl2(AlSi3O10)(OH)2)
mineral
Green Schist
Greenschist (Chlorite Schist)
metamorphic
Gneiss
Gneiss (Metamorphic rock)
metamorphic
Diorite
Diorite
igneous
Milky Quartz
Silicon Dioxide (SiO2)
mineral
Gabbro
Gabbro (Mafic Plutonic Rock)
igneous
Chalcedony (Agate/Quartz)
Silicon Dioxide (SiO2)
mineral
Basalt
Basalt (Mafic volcanic rock)
igneous
Quartz Pebble
Silicon Dioxide (SiO2)
mineral
Clear Quartz
Silicon Dioxide (SiO2)
mineral
Basalt
Mafic Igneous Basalt
igneous
Banded Gneiss
Gneiss
metamorphic
River Agate (Chert/Chalcedony)
Cryptocrystalline Quartz (SiO2)
sedimentary
Milky Quartz
Silicon Dioxide (SiO2)
mineral
Gneiss
Gneissic Metamorphic Rock
metamorphic
Scoria (Lava Rock)
Scoria
igneous
Basalt with Iron Oxidation
Amygdaloidal Basalt (silicate rock primarily plagioclase, pyroxene, and olivine)
igneous
Vesicular Basalt
Extrusive Basalt (Mafic Silicate)
igneous
Diorite (River Cobble)
Phaneritic Intermediate Plutonic Rock
igneous
Clear Quartz
Quartz (Silicon Dioxide, SiO2)
mineral
Basalt
Basalt (Volcanic Mafic Rock)
igneous
Basalt
Basalt (Mafic volcanic rock)
igneous
Pumice
Pumice (Vesicular Rhyolite/Andesite)
igneous
Basalt
Basalt (Extrusive Mafic Igneous)
igneous
Granite
Felsic Plutonic Rock
igneous
Basalt (Pahoehoe texture)
Mafic Volcanic Rock
igneous