Quartz Crystal on Matrix
Silicon Dioxide (SiO2)
mineral
Category
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Quartz Druzy (on Matrix)
Silicon Dioxide (SiO2)
mineral
Basalt with Quartz/Quartzite Veins
Aphanitic Mafic Volcanic Rock with Siliceous Infillings
igneous
Shale
Fissile Siliciclastic Sedimentary Rock
sedimentary
Sandstone Concretion
Moqui Marble / Ironstone Concretion (Iron oxide-cemented sandstone)
sedimentary
Quartz-veined Mudstone or Argillite
SiO2 (Quartz) in Siltstone/Mudstone matrix
sedimentary
Quartz in Matrix (possibly Basalt or Siltstone host)
Silicon Dioxide (SiO2) in Host Rock
mineral
Scoria
Scoria
Igneous
Quartz Vein in Host Rock
Quartz (SiO2) in Mafic or Sedimentary Matrix
igneous
Milky Quartz
Quartz (Silica / Silicon Dioxide), SiO2
mineral
Fossiliferous Limestone (Coquina)
Biogenic Limestone (Calcium Carbonate, CaCO3)
sedimentary
Quartz (Druzy)
Silicon Dioxide (SiO2)
mineral
Quartz Vein in Sandstone
Sandstone with Hydrothermal Quartz (SiO2)
sedimentary
Basalt with Weathering Rind
Basalt (Mafic volcanic rock)
igneous
Druzy Quartz on Matrix (likely Limestone or Sandstone)
Silicon Dioxide (SiO2) with various trace impurities
Mineral on Sedimentary Rock
Basalt
Basalt (Mafic volcanic rock)
igneous
Sandstone
Clastic sedimentary rock (primarily SiO2)
sedimentary
Basalt with Granite Inclusions (Xenoliths)
Mafic igneous rock (Basalt) with Sialic minerals
igneous
River Pebble (Quartzite or Chert)
Silicon Dioxide (SiO2)
metamorphic or sedimentary
Basalt
Basalt (Aphanitic-fine grained mafic igneous rock)
igneous
Sandstone
Arenite
sedimentary
Quartz pebble
Silicon Dioxide (SiO2)
mineral
Garnet Gneiss
Garnetiferous Gneiss
metamorphic
Porphyritic Basalt (River Rock)
Porphyritic Basalt
igneous
Sandstone (Micaceous)
Clastic Sedimentary Rock (primarily SiO2 with Mica)
sedimentary
Pebble or Cobble (likely composed of sandstone or conglomerate)
Clastic Sedimentary Rock (specific name like sandstone, conglomerate, or breccia would require microscopic analysis of clast size and angularity)
Sedimentary Rock (possibly a conglomerate or coarse-grained sandstone)
Brecciated Jasper
Silicon Dioxide (SiO2) with iron oxide inclusions
sedimentary
Granodiorite with Quartz Veining
Granodiorite (containing Plagioclase Feldspar, Quartz, and Biotite/Hornblende) with Quartz (SiO2) veins
igneous
Basalt
Basalt
igneous
Banded Slate or Siltstone with Quartz/Calcite Veins
Protolith-derived Siltstone or Slate (varies based on degree of metamorphism)
metamorphic
Dalmation Jasper (or Dalmation Stone)
Dalmation Stone (composed of Perthite, Quartz, and Arfvedsonite)
igneous
Granodiorite
Phaneritic-textured Intrusive Granodiorite
igneous
Banded Slate
Slate (Metamorphosed Siltstone/Mudstone)
metamorphic
Milky Quartz
Silicon Dioxide (SiO2)
mineral
River Pebble (Gravel)
Clastic sedimentary rock (likely Siltstone or Mudstone pebble; SiO2 with various impurities)
sedimentary
Diorite
Diorite (Intermediate intrusive igneous rock)
igneous
Ferruginous Sandstone (Ironstone)
Arenite with Limonite/Goethite cement
sedimentary
Andesite Porphyry
Andesite Porphyry
Igneous
Granite
Phaneritic Igneous Rock (Granite)
igneous
Shale
Shale (clastic sedimentary rock)
sedimentary
Quartz Druzy (Geode Fragment)
Silicon Dioxide (SiO2)
mineral
Sandstone with Quarzite clasts
Arenite (SiO2 based)
sedimentary