Quartz fragment (Pebble)
Silicon Dioxide (SiO2)
mineral
Category
Mineral, Specifically A Rock Fragment
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Conglomerate
Clastic sedimentary rock (Conglomerate)
sedimentary
Sandstone Pebble
Sedimentary Rock (Quartzose Sandstone)
sedimentary
Raw quartz (likely milky or smoky quartz)
Quartz, SiO₂
mineral
Tumbled greenstone-like pebble
Likely serpentine or chlorite-rich metamorphic rock; exact identification requires testing
mineral
River Pebble
Polished Quartzite or Mixed Lithology
sedimentary
River Cobble (Basaltic/Andesitic)
Mafic Igneous Porphyritic Rock
igneous
Desert Rose
Gypsum (variety Selenite) - CaSO4·2H2O
mineral
Quartz vein fragment (likely quartz with dark host rock)
Quartz (SiO₂) in an unidentified fine-grained host rock
metamorphic
Sandstone or Weathered Conglomerate
Sedimentary Rock (Quartzose Sandstone / Lithic Arenite)
sedimentary
Druzy quartz geode fragment
Quartz, SiO₂, with a coating of fine drusy crystals
mineral
Pink Granite
Phaneritic Felsic Igneous Rock (Granite)
igneous
Unidentified small rocks or gravel
sedimentary
Aggregate Concrete
Anthropogenic Conglomerate (Technosol)
sedimentary
Likely quartz-rich stone or pale feldspar fragment
Indeterminate; possibly quartz (SiO₂) or feldspar (KAlSi₃O₈–NaAlSi₃O₈)
mineral
Basalt with Chert/Obsidian blade
Aphanitic Mafic Igneous Rock (Basalt) with Microcrystalline Silica (Chert)
igneous
Pink Granite
Granite (Phaneritic Felsic Igneous Rock)
igneous
Unidentified Rock Fragment
Unknown
Rock
Chert (Flint Nobule)
Silicon Dioxide (SiO2)
sedimentary
Conglomerate (Greenstone/Pebble Conglomerate)
Polymictic Conglomerate
sedimentary
Bumble Bee Jasper
Calcite-bearing Volcanic Tuff (not a true Jasper)
sedimentary
Pink Granite
Phaneritic Felsic Intrusive Igneous Rock
igneous
Aquamarine
Beryl (Be3Al2Si6O18), specifically the blue-green variety
Mineral
Sandstone and Gravel Aggregate
Clastic Sedimentary Rock / Quartzose Sandstone
sedimentary
Pink Granite
Granite (Phaneritic felsic intrusive igneous rock)
igneous
Rounded quartz pebble
Quartz (silicon dioxide, SiO₂)
mineral
Polished brecciated jasper
Silica-rich microcrystalline quartz/chalcedony (SiO₂), with iron-oxide staining and angular mineral fragments
metamorphic
Milky Quartz (Common Quartz)
Quartz (Silicon Dioxide, SiO2)
mineral
Milky quartz pebble
Quartz (silicon dioxide, SiO₂)
mineral
Gneiss (specifically a weathered Amphibolite or Garnet Gneiss)
Gneiss (complex silicate composition)
metamorphic
Breccia Pebble
Sedimentary Breccia
sedimentary
Red Sandstone
Arenite (primarily quartz with iron oxide cement)
sedimentary
Jasper (Zebra Jasper)
Silicon Dioxide (SiO2) with impurities
sedimentary
Emerald in Matrix
Beryllium Aluminum Silicate (Be3Al2(SiO3)6) with Chromium/Vanadium
gemstone
Breciated Jasper
Silicon Dioxide (SiO2) with iron oxide inclusions
sedimentary
Montana Moss Agate
Chalcedony (SiO2) with Manganese/Iron oxide inclusions
sedimentary
Quartz (Druzy or Geode fragment)
Silicon Dioxide (SiO2)
mineral
Pink Granite
Phaneritic Felsic Igneous Rock
igneous
Chalcedony Geode Fragment
Silicon Dioxide (SiO2) - Microcrystalline Quartz
sedimentary
Bumblebee Jasper
Volcanic Tuff (mixture of Quartz, Sulfur, Hematite, and Orpiment)
igneous
Serpentine
Serpentinite (group of minerals based on (Mg,Fe,Ni,Al,Zn,Mn)2-3(Si,Al,Fe)2O5(OH)4)
metamorphic
Concrete-like aggregate surface with embedded rock fragments
Anthropogenic concrete or exposed aggregate; not a natural rock specimen
sedimentary