Tumbled pale quartz/chalcedony fragment
Quartz (SiO₂), possibly microcrystalline chalcedony
mineral
Category
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Iron-rich quartzite or ferruginous metamorphic rock
Quartzite, predominantly SiO₂, stained by iron oxides (hematite/goethite)
metamorphic
Likely tumbled calcite or pale limestone fragment
Calcite (CaCO₃), possibly microcrystalline limestone
mineral
Vesicular Basalt (Lava Rock)
Basalt (Vesicular Variety)
igneous
Pumice
Pumice (Vesicular volcanic glass)
igneous
Small seashell fossil or shell fragment
Likely calcium-carbonate shell material, chiefly aragonite or calcite; exact species indeterminate
fossil
Moonstone
Orthoclase and Albite (KAlSi3O8 / NaAlSi3O8)
gemstone
Carnelian
Carnelian (Cryptocrystalline Quartz, SiO2)
mineral
Milky Quartz
Silicon Dioxide (SiO2)
mineral
Banded Agate
Cryptocrystalline Silica (SiO2)
mineral
Chert (Limestone-based)
Silicon dioxide (SiO2)
sedimentary
Chert (Yellow Jasper/Flint)
Microcrystalline Quartz (SiO2)
sedimentary
Red Jasper
Silicate (SiO2 with Hematite impurities)
sedimentary
Fossilized Coral
Scleractinia (fossil order), primarily Calcium Carbonate (CaCO3)
sedimentary
Chert (Flint)
Chert (Cryptocrystalline Quartz, SiO2)
sedimentary
Chert (Chalcedony/Agate)
Microcrystalline Quartz (SiO2)
sedimentary
Concretion in Shale
Siltstone/Shale with Siderite or Calcareous concretions
sedimentary
Sunstone (Heliolite)
Plagioclase Feldspar ((Ca,Na)(Al,Si)4O8)
mineral
Red Scoria
Vesicular Basaltic Andesite
igneous
Garnet
Garnet group species (likely Almandine, Fe3Al2(SiO4)3)
mineral
Apache Tear
Obsidian (Hydrated Silica / Amorphous Volcanic Glass)
igneous
Pink Feldspar
Orthoclase (KAlSi3O8) or Microcline
mineral
Sandstone
Sedimentary Clastic Rock
sedimentary
Diamond (in jewelry)
Diamond (Carbon, C)
mineral
Granite
Granite (Plutonic Igneous Rock)
igneous
Quartzite
Metamorphic Quartzite (SiO2)
metamorphic
Granite Pebble
Granite
igneous
Olivine in Quartz/Feldspar Matrix (Peridotite or Granitic Pegmatite)
(Mg,Fe)2SiO4 (Olivine) with Quartz / Feldspar
igneous
Jasper (Green)
Silicon dioxide (SiO2)
Mineral/Sedimentary
Dalmatian Stone
Peralkaline rhyolite with arfvedsonite inclusions
igneous
Rough Sodalite
Sodalite, Na8(Al6Si6O24)Cl2
mineral
Amethyst
Silicon dioxide (SiO2) with iron impurities
mineral
Greenstone / Greenstone Pebble
Greenschist (metamorphosed basalt or gabbro)
metamorphic
Jadeite Jade
Jadeite (NaAlSi2O6)
metamorphic
Sodalite
Sodalite (Na8(Al6Si6O24)Cl2)
Mineral
Yellow Jasper
Silicon Dioxide (SiO2) with iron hydroxides (Goethite)
sedimentary
Emerald
Beryl (Be3Al2Si6O18 with Chromium/Vanadium impurities)
mineral
Milky Quartz
Quartz (Silicon Dioxide, SiO2)
mineral
Serpentinized ultramafic rock with magnesite
Serpentinite, chiefly serpentine-group minerals (Mg₃Si₂O₅(OH)₄), with likely magnesite (MgCO₃) and minor chromite/magnetite
metamorphic
River Sandstone (Lithic Arenite)
Lithic Sandstone (SiO2 dominated with lithic fragments)
sedimentary
Rose quartz (likely)
Quartz, silicon dioxide (SiO₂), pink variety
mineral
Granite
Phaneritic Intrusive Igneous Rock (primarily composed of SiO2, Al2O3, K2O, Na2O)
igneous