Chert with Quartz Druzy
Microcrystalline Quartz (SiO2) with Drusy Quartz Coating
sedimentary
Category
Mineral Side Rock
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Quartz
Silicon Dioxide (SiO2)
mineral
Amygdaloidal Basalt
Amygdaloidal Basalt (Mafic Volcanic Rock)
igneous
Turquoise
Hydrated phosphate of copper and aluminium (CuAl6(PO4)4(OH)8·4H2O)
mineral
Basalt
Basalt
igneous
Shale
Fissile Mudstone (primarily composed of clay minerals and quartz)
sedimentary
Petrified Wood
Silicified Wood (SiO2)
fossil
Vesicular Basalt
Vesicular Basalt (rich in silicate minerals mostly Plagioclase and Pyroxene)
igneous
Serpentinite
Serpentinite (composed primarily of Serpentine group minerals, e.g., Antigorite, Lizardite, Chrysotile)
metamorphic
Greenstone / Serpentinite
Serpentinite (composed primarily of minerals from the serpentine group Mg3Si2O5(OH)4)
metamorphic
Yellow Chert (Jasper)
Microcrystalline Quartz (SiO2)
sedimentary
Pink Granite
Phaneritic intrusive igneous rock (K-feldspar rich)
igneous
Schist
Mica Schist
metamorphic
Biotite Mica
K(Mg,Fe)3AlSi3O10(OH)2
Mineral in a matrix (likely quartz or feldspar)
Vesicular Basalt with Calcification
Vesicular Basalt (Aphanitic extrusive igneous rock)
igneous
Greenstone
Greenschist-facies basaltic rock
metamorphic
Feldspathic Gneiss (Granite Gneiss)
Gneiss (High-grade Regional Metamorphic Rock)
metamorphic
Asphalt (Bituminous Concrete)
Bituminous Concrete / Pavement
man-made (synthetic rock)
Amethyst
Silicon Dioxide (SiO2) with iron impurities
mineral
River Quartz Pitting/Cobble
Silicon Dioxide (SiO2)
mineral
Greenstone / Quartzite Pebble
Metamorphosed Quartz-rich Rock
metamorphic
Turquoise
Hydrated phosphate of copper and aluminum, CuAl6(PO4)4(OH)8·4H2O
mineral
Pyrite (Fool's Gold)
Iron Sulfide (FeS2)
mineral
Sandstone
Arenite
sedimentary
Sandstone
Arenite (Sedimentary rock composed of sand-sized grains)
sedimentary
River Cobble (Basaltic/Andesitic)
Mafic Igneous Porphyritic Rock
igneous
Banded Gneiss
Gneiss (typically quartz, feldspar, mica, amphibole composition)
metamorphic
Red Jasper
Silicon Dioxide (SiO2) with iron oxide inclusions
mineral
Milky Quartz
Quartz (Silicon Dioxide, SiO2)
mineral
Moss Agate
Chalcedony (Silicon Dioxide) with dendritic inclusions (SiO2)
mineral
Quartz (Milky/Common)
Silicon Dioxide (SiO2)
mineral
Stiped Slate Beach Pebble
Low-grade Metamorphic Slate with Quartz Vein (SiO2 on Phyllosilicate base)
metamorphic
Granodiorite
Granodiorite
igneous
Granite
Granite (Felsic intrusive igneous rock)
igneous
Granitic Pegmatite
Pegmatite
igneous
Granite
Phaneritic plutonic rock (primarily Quartz, Feldspar, and Mica)
igneous
Limonite (Iron Ore)
Limonite (Hydrous iron(III) oxide-hydroxide mixture, primarily FeO(OH)·nH2O)
mineral
Dalmatian Jasper
Peralkaline Quartz-Feldspar Porphyry with Arfvedsonite
igneous
Amethyst (Scepter/Double Terminated Point)
Silicon Dioxide (SiO2)
mineral
Quartz (in a rock matrix)
Quartz (SiO2)
mineral
Amethyst
Silicon Dioxide (SiO2) with iron impurities
mineral
Rose Quartz
Silicon Dioxide (SiO2) with trace amounts of titanium, iron, or manganese
mineral