Basalt
Mafic Igneous Rock (composed primarily of pyroxene and calcium-rich plagioclase)
igneous
Category
Sedimentary (Primary) With Artificial Modification
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Granite
Granite (Felsic Intrusive Igneous Rock)
igneous
Gray Granite
Granite (Phaneritic igneous rock)
igneous
Nephrite Jade
Nephrite (Ca2(Mg,Fe)5Si8O22(OH)2)
metamorphic
Quartz (Crystal Fragment)
Silicon Dioxide (SiO2)
mineral
Granite (Dioritic variant)
Granite (Phaneritic Igneous Rock)
igneous
Peridotite (Dunite)
Peridotite (mostly Olivine: (Mg,Fe)2SiO4)
igneous
Basalt
Basalt (Mafic Extrusive Igneous Rock)
igneous
Granite Pebble
Granite (composed primarily of Quartz, Feldspar, and Mica)
igneous
Basalt
Mafic volcanic rock (primarily plagioclase feldspar and pyroxene)
igneous
Quartz Vein in Host Rock
Quartz (SiO2) in metamorphic host rock (likely schist or phyllite)
metamorphic
Basalt
Vesicular Basalt
igneous
Quartz (Vein Quartz)
Silicon Dioxide (SiO2)
mineral
Basalt
Basalt (Mafic volcanic rock)
igneous
Diabase (Dolerite) Cobble
Diabase / Dolerite
igneous
Basalt
Basalt (composition predominately Plagioclase feldspar and Pyroxene)
igneous
Limonite (Iron Ore)
Limonite (Hydrated iron oxide - FeO(OH)·nH2O)
mineral
Basalt with Vesicles
Vesicular Basalt (comprising Plagioclase Feldspar, Pyroxene, and Olivine)
igneous
Greenshist / Chlorite Schist
Chlorite schist (contains (Mg,Fe)3(Si,Al)4O10(OH)2·(Mg,Fe)3(OH)6)
metamorphic
Milky Quartz
Quartz (Silicon Dioxide, SiO2)
mineral
Granite Pebble
Granite (Phaneritic Igneous Rock)
igneous
Blue Lace Agate
Silicon Dioxide (SiO2) - Variety of Chalcedony
mineral
Chert (or possibly Flint)
SiO2 (Silicon Dioxide)
Sedimentary Rock
Clay (as a rock-forming material)
Clay minerals (e.g., Kaolinite group, Smectite group, Illite group, Chlorite group)
Mineral
Quartz (likely Milky Quartz or Chalcedony)
Quartz (SiO2 - Silicon Dioxide)
Mineral
Blue Sapphire
Corundum (Al2O3)
mineral
Yellow Diamond (Faceted)
Diamond (pure carbon) with nitrogen impurities, C
mineral
Gold Flakes in Oil (Novelty Specimen)
Native Gold (Au)
mineral
Jadeite Jade
NaAlSi2O6 (Sodium Aluminum Silicate)
metamorphic
Milky Quartz
Silicon Dioxide (SiO2)
mineral
Orthoclase Feldspar
KAlSi3O8 (Potassium Aluminum Silicate)
mineral
Milky Quartz
Silicon Dioxide (SiO2)
mineral
Epidotite (Unakite-related Epidote)
Epidote (Ca2(Al2,Fe)(SiO4)(Si2O7)O(OH))
metamorphic
Milky Quartz
Silicon Dioxide (SiO2)
mineral
Milky Quartz
Quartz (Silicon Dioxide - SiO2)
mineral
Milky Quartz
Silicon Dioxide (SiO2)
mineral
Granite
Granite (Phaneritic Igneous Rock; primarily Quartz, Alkali Feldspar, and Plagioclase)
igneous
Sapphire
Corundum (Al2O3)
mineral
Chrysocolla on Quartz with Iron Oxides
Cu2-xAlx(H2-xSi2O5)(OH)4·n(H2O)
mineral
Quartz (Milky or Rose variety)
Silicon Dioxide (SiO2)
mineral
Milky Quartz
Silicon Dioxide (SiO2)
mineral
Hemimorphite on Limonite Gossan
Hemimorphite (Zn4Si2O7(OH)2·H2O) on Limonite matrix
mineral