Breciated Jasper
Silicon Dioxide (SiO2) with iron oxide inclusions
sedimentary
Category
Man Made (Synthetic Rock)
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Sandstone (with Iron Staining)
Arenite (primarily SiO2 with Fe2O3/FeO(OH) oxides)
sedimentary
Hag Stone (Adder Stone / Geode-bearing Pebble)
Sedimentary Rock with Cavity (often Quartzite, Limestone, or Sandstone)
sedimentary
Vesicular Basalt with Quartz/Chalcedony
Vesicular Basalt (primarily Plagioclase, Pyroxene, and Olivine with SiO2 infill)
igneous
Basalt
Extrusive mafic igneous rock
igneous
Basalt with Quartz/Calcite Veining
Basalt (principally Plagioclase and Pyroxene)
igneous
Granite
Granite
Igneous
Druzy Quartz on Matrix
Silicon Dioxide (SiO2)
mineral
Weathered Sandstone or Siltstone
Sedimentary Rock
sedimentary
Basalt pebble
Aphanitic Mafic Volcanic Rock (Fe/Mg rich)
igneous
Orbicular granite (likely rapakivi-type granite)
Granite; chiefly quartz, alkali feldspar, plagioclase, and biotite/hornblende
igneous
Slickenside
Tectonic Fault Scarp Surface
metamorphic
Basalt
Extrusive Igneous Rock
igneous
Basalt
Mafic Igneous Rock (composed primarily of pyroxene and calcium-rich plagioclase)
igneous
Quartz Vein in Host Rock
Hydrothermal Quartz (SiO2) in Slates/Schists
metamorphic
Sandstone (Quartzose)
Arenite (primarily SiO2)
sedimentary
Shale
Lutaceous sedimentary rock
sedimentary
Quartz-rich mineral fragment
Quartz (silicon dioxide, SiO₂), possibly milky quartz
mineral
Basalt with Quartz Veins
Aphanitic Mafic Igneous Rock (Main body: SiO2, Fe, Mg rich)
igneous
Sandstone
Arenite (primarily SiO2)
sedimentary
Eclogite
Eclogite (High-pressure metamorphic rock)
metamorphic
Rugose Coral Fossil
Order Rugosa
fossil
Fossil Shell
Invertebrate fossil (Mollusca)
fossil
Weathered granitic rock
Granite, likely quartz–feldspar–mica aggregate
igneous
Sandstone Pebble / Quartzite Pebble
SiO2 (Silicon Dioxide enriched sedimentary rock)
sedimentary
Druzy Quartz Geode
Silicon Dioxide (SiO2)
mineral
Basalt
Extrusive igneous rock primarily composed of plagioclase feldspar and pyroxene
igneous
Chalcedony Geode
Silicon Dioxide (SiO2)
mineral
Quartzite with Schist layers
Metamorphosed Quartz-rich Rock (Mixed Schist/Quartzite)
metamorphic
Milky Quartz
Silicon Dioxide (SiO2)
mineral
Dalmation Jasper
Aplite with Arfvedsonite inclusions (SiO2 with Na3(Mg,Fe2+)4AlSi8O22(OH)2)
igneous
Basalt
Basalt (Aphanitic Mafic Igneous Rock)
igneous
Serpentinite
Serpentinite (complex silicate minerals including lizardite, chrysotile, and antigorite: (Mg,Fe)3Si2O5(OH)4)
metamorphic
Pink Granite
Phaneritic Plutonic Igneous Rock (high K-feldspar)
igneous
Red Sandstone
Sandstone (principally Quartz with Iron Oxide coating)
sedimentary
Granitic Pebble (Glacial Erratic)
Granite
igneous
Shale
Fissile mudstone (Shale)
sedimentary
Generic Rock Fragment
Rock Fragment
sedimentary
Vesicular Basalt (Lava Rock)
Basalt (Vesicular Variety)
igneous
Gneiss Pebble
Gneiss
metamorphic
Chert (River Pebble)
Microcrystalline Quartz (SiO2)
sedimentary
Quartz-Veined Gneiss or Metamorphic Rock with Quartz Veins
Quartz-veined metamorphic rock (Silicate mineral assemblage)
metamorphic