Small pale rock fragment
Indeterminate; possibly quartz, calcite, or a weathered feldspar-rich fragment
mineral
Category
Not A Rock Or Mineral (Anthropogenic Material)
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Sandstone
Quartz Sandstone (predominantly)
Sedimentary
Sandstone
Arenite (SiO2 primarily)
sedimentary
Likely milky quartz, possibly quartz-rich vein rock
Quartz (SiO₂); identification from the image is uncertain
mineral
Sandstone
Clastic Sedimentary Rock
sedimentary
Granite
Granite (Plutonic Igneous Rock)
igneous
Sandstone
Sandstone (clastic sedimentary rock)
sedimentary
Sandstone
Arenite (clastic sedimentary rock)
sedimentary
Weathered granite or granitic gneiss
Granite: quartz, feldspar, and mica; possibly gneiss if the dark minerals are banded
igneous
Leopard jasper (orbicular jasper)
Silicified volcanic rock, chiefly microcrystalline quartz/chalcedony (SiO₂) with feldspar and iron-oxide inclusions
metamorphic
Likely weathered igneous rock fragments
Indeterminate; possibly basaltic or granitic rock with quartz, feldspar, and dark mafic minerals
igneous
Sandstone
Arenite (SiO2 based typically)
sedimentary
Sandstone
Arenite (SiO2 primarily)
sedimentary
Granite
Granite (Plutonic Igneous Rock)
igneous
Mixed gravel and mineral fragments
Polymictic unconsolidated sediment; likely quartz, feldspar, chert, mica, and lithic fragments
sedimentary
Red granite or granitic gneiss cobble
Quartz–feldspar–mica rock; likely granite, possibly gneiss
igneous
Exposed shoreline bedrock and sediment
Unidentified natural rock; the image does not show enough detail for a specific geological identification
sedimentary
Vuggy Quartz on Matrix
Silicon Dioxide (SiO2)
mineral
Jasper
Silicon dioxide (Microcrystalline quartz, SiO2)
mineral
Quartz cluster, possibly druzy quartz on matrix
Quartz (SiO₂), likely microcrystalline to coarse crystalline; associated matrix uncertain
mineral
Fulgurite
Fulgurite (Lechatelierite/Silica glass)
mineral
Tumbled quartz-rich pebble
Microcrystalline quartz (SiO₂), possibly chalcedony or quartzite
mineral
Likely weathered quartz-rich rock fragment
Uncertain; possibly quartz-bearing granitic or metamorphic material (SiO₂-dominant)
mineral
Botryoidal chalcedony geode
Microcrystalline quartz (SiO₂), likely chalcedony with quartz druse
mineral
Vesicular basalt (likely scoriaceous basalt)
Mafic volcanic rock, chiefly plagioclase, pyroxene, and olivine; commonly iron-rich volcanic glass
igneous
Sandstone
Arenite
sedimentary
Sandstone
Clastic Sedimentary Rock
sedimentary
Petrified Wood
Silicified wood (Quartz/Chalcedony replacement of cellulose)
fossil
Breciated Limestone with Calcite Veins
Sedimentary Breccia (CaCO3)
sedimentary
Quartz
Silicon Dioxide (SiO2)
mineral
Sandstone (Ferruginous)
Arenite (SiO2 with iron oxide impurities)
sedimentary
Weathered pale-blue rock fragment
Unidentified; the image does not show enough detail for a reliable geological identification
sedimentary
Sandstone
Clastic Sedimentary Rock
sedimentary
Sandstone
Sedimentary Rock (Quartz Sandstone)
sedimentary
Unidentified dark mineral or rock specimen
Indeterminate from the severely blurred image; possible dark igneous rock or opaque mineral
mineral
Sandstone
Arenite (primarily SiO2)
sedimentary
Sandstone
Clastic sedimentary rock (primarily quartz arenite)
sedimentary
Polished white-and-brown chalcedony (likely agate/jasper)
Microcrystalline quartz, SiO₂; chalcedony with iron-oxide staining or jasperous inclusions
mineral
Sandstone
Sedimentary Rock (Quartz arenite)
sedimentary
Shale
Sedimentary rock composed of clay minerals and quartz
sedimentary
Sandstone (Quartzose)
Arenite (primarily SiO2)
sedimentary
Sandstone
Arenite
sedimentary