Gabbro (Indigo Gabbro)
Gabbro (mafic intrusive igneous rock)
igneous
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Basalt with Quartz Veining
Basalt (Mafic Volcanic Rock)
igneous
Sandstone (Quartzose Sandstone)
Clastic Sedimentary Rock (primarily SiO2)
sedimentary
Sandstone
Clastic Sedimentary Rock (composed primarily of Quartz, SiO2)
sedimentary
Conglomeratic Sandstone
Clastic Sedimentary Rock
sedimentary
Vesicular Basalt (Amygdaloidal)
Amygdaloidal Basalt (Mafic volcanic rock)
igneous
Gneiss with Quartz Veining
Gneiss (High-grade Regional Metamorphic Rock)
metamorphic
Gneiss
Gneiss
metamorphic
Basalt
Basalt (composition of plagioclase feldspar and pyroxene)
igneous
Moss Agate
SiO2 with impurities (Chalcedony)
Mineral/Gemstone
Basalt
Mafic volcanic rock (various silicate minerals including Pyroxene and Plagioclase)
igneous
Basalt
Basalt (principally Plagioclase Feldspar and Pyroxene)
igneous
Slag
Ferrous slag (by-product of iron smelting)
Mineraloid / Anthropogenic
Granite (with Quartz and Mica)
Phaneritic Felsic Igneous Rock
igneous
Basalt
Mafic Igneous Rock (composed primarily of pyroxene and calcium-rich plagioclase)
igneous
Greenstone
Metabasalt (composed of chlorite, epidote, and actinolite)
metamorphic
Mica Schist with Quartz
Crystalline Schist (SiO2 + KAl2(AlSi3O10)(OH)2)
metamorphic
Shale with Quartz Veins
Fissile Sedimentary Rock (SiO2)
sedimentary
Amygdaloidal Basalt
Basalt with secondary mineral infilling
igneous
Granite
Phaneritic plutonic rock (primarily Quartz, Feldspar, and Mica)
igneous
Basalt with Quartz Vein
Basalt (extrusive igneous rock) with Quartz (SiO2) inclusion
igneous
Granite
Plutonic Granite
igneous
Geode with Iron-Stained Quartz/Calcite
Silicon Dioxide (SiO2) or Calcium Carbonate (CaCO3) in Sedimentary Matrix
sedimentary
Amethyst (Scepter Quartz)
Silicon Dioxide (SiO2) with Iron impurities
mineral
Biotite on Quartz Matrix
Biotite - K(Mg,Fe)3(AlSi3O10)(OH,F)2 with Quartz (SiO2)
mineral
Fluorite
Fluorite (Calcium Fluoride, CaF2)
mineral
Greenstone / Basalt
Metabasalt (often containing Chlorite, Epidote, and Actinolite)
igneous
Gneiss (Metamorphosed Granitic Rock)
Gneiss (composed mainly of quartz, feldspar, biotite, and/or hornblende)
metamorphic
Greenstone
Metabasalt
metamorphic
Conglomerate
Conglomerate
sedimentary
Shale (possibly Carbonaceous or Oil Shale)
Laminated Mudstone (primarily clay minerals and quartz)
sedimentary
Weathered Basalt with Iron Staining
Mafic Igneous Rock
igneous
Gneiss
Gneiss (foliated metamorphic rock)
metamorphic
Basalt
Extrusive Igneous Rock
igneous
Vesicular Basalt with Magnetite/Hematite
Mafic Extrusive Igneous Rock (primarily Plagioclase and Pyroxene)
igneous
Biotite Schist
Biotite Schist (containing K(Mg,Fe)3AlSi3O10(OH)2)
metamorphic
Fuchsite (Green Muscovite)
Fuchsite (Chromium-rich Muscovite), K(Al,Cr)2(AlSi3O10)(OH)2
mineral
Mica Schist
Mica-rich Schist containing Muscovite and Quartz
metamorphic
Mica Schist
Mica Schist (predominantly Muscovite or Biotite sheet silicates)
metamorphic
Weathered basaltic cobble
Basalt, likely amygdaloidal or vesicular basalt
igneous
Sandstone (Quartzose)
Arenite (primarily SiO2)
sedimentary
Titanium Aura Quartz (Aura Quartz)
Titanium-coated Silicon Dioxide (SiO2)
mineral