Sandstone
Sedimentary Rock (Quartz Sandstone)
sedimentary
Category
Mineral, Part Of A Rock
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Vesicular Basalt (or Scoria)
Vesicular Basalt
igneous
Sandstone
Arenite
sedimentary
Desert Rose
Gypsum (CaSO4·2H2O) or Barite (BaSO4)
mineral
Sandstone (Quartzose)
Arenite (SiO2 based typically)
sedimentary
Granite
Felsic intrusive igneous rock
igneous
Quartz Geode
Silicon Dioxide (SiO2)
sedimentary
Granite
Granite (felsic intrusive igneous rock)
igneous
Moonstone
Orthoclase (Potassium Aluminum Silicate), Formula: (K,Na)AlSi3O8
mineral
Leopard jasper (orbicular jasper)
Silicified volcanic rock, chiefly microcrystalline quartz/chalcedony (SiO₂) with feldspar and iron-oxide inclusions
metamorphic
Sedimentary Rock Fragments
Clastic Sedimentary Rock
sedimentary
Granite Cobble
Granite
igneous
Sandstone
Clastic Sedimentary Rock
sedimentary
Quartz Geode
Silicon Dioxide (SiO2) within a geode
mineral
Quartz in Matrix (possibly Basalt or Siltstone host)
Silicon Dioxide (SiO2) in Host Rock
mineral
Basalt (Vesicular or Porphyritic River Pebble)
Mafic Volcanic Rock (Aphanitic to Porphyritic Basalt)
igneous
Unidentified weathered mineral/rock fragment
Indeterminate; likely a weathered iron-rich silicate or sulfide-bearing specimen
mineral
Agated Chert
Microcrystalline Quartz (SiO2)
sedimentary
Biotite Mica Schist
Metamorphic Rock containing Biotite K(Mg,Fe)3AlSi3O10(OH)2
metamorphic
Moqui Marble
Hematite-Goethite Concretion
mineral
Gneiss
Foliated Metamorphic Rock (Gneiss)
metamorphic
Sandstone with Concretions / Liesegang Rings
Arenite with iron oxide banding
sedimentary
Mixed river-worn rock and mineral collection
Mostly quartz/quartzite, feldspar-bearing granitoid, chert, and mafic volcanic rocks; exact species vary by pebble
igneous, sedimentary, metamorphic, mineral
Vesicular Basalt (or Scoraceous Basalt)
Basalt (Vesicular texture)
igneous
Granite
Felsic intrusive igneous rock
igneous
Shale
Shale (clastic sedimentary rock)
Sedimentary
Sandstone (with Iron Staining)
Clastic Sedimentary Rock (primarily Quartz, SiO2)
sedimentary
Slate with Quartz Vein
Foliated Metamorphic Rock (Mainly Quartz, Muscovite, Chlorite)
metamorphic
Unidentified gray rock/mineral specimen
Indeterminate; possibly quartz-rich rock or a metallic sulfide-bearing specimen
mineral
Sandstone
Clastic Sedimentary Rock
sedimentary
Sandstone Cobble with Iron Staining
Arenite with Limonite/Hematite staining
sedimentary
River Stone (Sedimentary Sandstone/Quartzite)
Arenite/Quartzite transition specimen
sedimentary
Banded Sandstone Peabble
Arenite with iron oxide banding
sedimentary
Wishing Rock (Quartz Vein in Host Rock)
Silicon dioxide (SiO2) vein in various host rocks
Igneous/Sedimentary/Metamorphic with Mineral Vein
Sandstone with Quarzite clasts
Arenite (SiO2 based)
sedimentary
Sandstone (Weathered Cobble)
Clastic sedimentary rock (primarily SiO2)
sedimentary
Gravel or Crushed Stone
Fragmented Aggregate Stone
sedimentary or igneous fragment
Peach Moonstone
Potassium Aluminum Silicate (KAlSi3O8)
mineral
Quartz (Druzy on Matrix)
Silicon Dioxide (SiO2)
mineral
Sandstone
Sedimentary Rock (Quartz arenite/Arkose)
sedimentary
Quartz Geode
Silicon Dioxide (SiO2)
mineral
Banded Slate or Siltstone with Quartz/Calcite Veins
Protolith-derived Siltstone or Slate (varies based on degree of metamorphism)
metamorphic