Moonstone
Orthoclase Feldspar (KAlSi3O8)
mineral
Category
Not A Rock
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Sandstone
Arenite (SiO2 based)
sedimentary
Quartz Geode
Silicon Dioxide (SiO2) within a geode
mineral
Druzy Quartz on Host Rock
Silicon Dioxide (SiO2) with various iron-oxide inclusions
mineral
Shatter Cone
Impactite (Shatter Cone texture)
metamorphic
Granite
Granite (composed primarily of Quartz, Feldspar, and Mica/Amphibole)
igneous
Quartz (on matrix)
Quartz (Silicon Dioxide, SiO₂)
Mineral
Sandstone (Ferruginous)
Arenite (SiO2 with iron oxide impurities)
sedimentary
Ferruginous Sandstone (Ironstone Nodules)
Ferruginous Quartz-Arenite (with Goethite/Hematite cement)
sedimentary
Dalmatian Jasper
Peralkaline Quartz-feldspathic Rock (Arfvedsonite-bearing)
igneous
Porphyritic Basalt (Chinese Flower Stone / Chrysanthemum Stone basalt variety)
Porphyritic Basalt containing Plagioclase Feldspar phenocrysts
igneous
Herkimer Diamond
Quartz (Silicon Dioxide, SiO2)
mineral
Asphalt (Bituminous Slate/Sandstone)
Asphaltum / Bituminous Rock
sedimentary
Sandstone (with Iron Staining)
Clastic Sedimentary Rock (primarily Quartz, SiO2)
sedimentary
Amygdaloidal Basalt
Amygdaloidal Basalt (Mafic volcanic rock)
igneous
Chert Geode or Nodule
Microcrystalline Quartz (SiO2)
sedimentary
Quartzite (Iron-stained)
Quartzite (SiO2 with Fe2O3 staining)
metamorphic
Chert (Nodule)
Microcrystalline or Cryptocrystalline Silica (SiO2)
sedimentary
Chert Breccia (Yellow Jasper)
Silicon Dioxide (SiO2) - Brecciated Chert
sedimentary
Bauxite / Iron-rich Laterite
Laterite (principally Al(OH)3, Fe2O3, and SiO2)
sedimentary
Druzy Quartz Geode (Oco or Moroccan variety)
Silicon Dioxide (SiO2)
mineral
Basalt (Amygdaloidal)
Amygdaloidal Basalt
igneous
Red Siltstone (or Red Shale)
Clastic Sedimentary Rock (Composition: primarily Quartz, Clay minerals, and Hematite Fe2O3)
sedimentary
Basalt (Vesicular)
Vesicular Basalt
igneous
Schist (Oxidized)
Mica Schist with Iron Oxide staining
metamorphic
Banded Agate (Polished Slice)
Chalcedony (cryptocrystalline Quartz), SiO2
mineral
Vesicular Basalt
Basalt (with vesicular texture)
igneous
Sandstone (specifically Banded Sandstone)
Clastic sedimentary rock (primarily SiO2)
sedimentary
Sandstone with Quartz Veins
Arenite (primarily SiO2 with Fe2O3 staining)
sedimentary
Chalcedony (Agate)
Silicon Dioxide (SiO2)
mineral
Sandstone with Quartz Vein
Arenite with SiO2 intrusion
sedimentary
Sandstone
Arenite (SiO2 principal)
sedimentary
Quartz Geode
Silicon Dioxide (SiO2)
mineral
Gneiss (High-Grade Metamorphic Rock)
Gneiss (primarily composed of Quartz, Feldspar, and Mica/Amphiboles)
metamorphic
Scoria (Lava Rock)
Scoria
igneous
Quartzite River Rock
Quartzite (SiO2)
metamorphic
Basalt
Basalt
igneous
Quartz Geode
Quartz (Silicon Dioxide, SiO2) in a Geode
sedimentary
Sandstone (Iron-stained)
Arenite (composed primarily of SiO2 with Fe2O3 staining)
sedimentary
Granite
Granite
Igneous
Gneiss
Foliated Metamorphic Rock (Gneiss)
metamorphic
Dalmatian Jasper
Peralkaline rock with Tourmaline spots
igneous