Brecciated Jasper
Silicon Dioxide (SiO2) with iron oxide inclusions
sedimentary
Category
Mineral, Specifically A Rock Fragment
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Weathered quartz-rich pebble (tentative)
Likely quartz/chalcedony, SiO₂, possibly iron-stained
mineral
Ethiopian Fire Opal
Hydrated Silica (SiO2·nH2O)
mineral
Satin Spar Selenite
Gypsum (Calcium Sulfate Dihydrate) - CaSO4·2H2O
mineral
Chert (Jasper-rich)
Silicon Dioxide (SiO2)
sedimentary
Agate
Silicon Dioxide (SiO2)
mineral
Milky Quartz
Quartz (Silicon Dioxide, SiO2)
mineral
Fossil Coral
Hexagonaria (Rugose coral) / Rugosa
fossil
Green Aventurine
Quartz (Silicon Dioxide, SiO2) with fuchsite inclusions
mineral
Sardonyx Cameo
Silicon Dioxide (SiO2) - variety Cryptocrystalline Quartz
Mineral
Chert (specifically Flint)
Microcrystalline or cryptocrystalline Quartz (SiO2)
sedimentary
Red Jasper with Quartz
Microcrystalline Quartz (SiO2)
sedimentary
Granite
Granite (Felsic Plutonic Rock)
igneous
Sandstone
Clastic sedimentary rock
sedimentary
Sandstone
Arenite (SiO2 predominantly)
sedimentary
Quartz / Chalcedony Geode Fragment
Silicon Dioxide (SiO2)
mineral
Greenstone / altered basalt fragment
Likely chlorite–epidote–actinolite altered basalt; exact identification requires testing
igneous
Chalcedony Nodule (Agate/Chert)
Chalcedony (cryptocrystalline Silicon Dioxide, SiO2)
mineral
Granite Pebble
Phaneritic Felsic Igneous Rock (Granite)
igneous
Sandstone
Arenite (SiO2 dominant)
sedimentary
Milky Quartz
Quartz (Silica / Silicon Dioxide), SiO2
mineral
Weathered iron-rich rock fragment
Likely limonite/goethite-bearing material; exact identification requires testing
mineral
Basalt with Epidote Veins
Mafic Igneous Rock (Basalt)
igneous
Sandstone
Clastic Sedimentary Rock
sedimentary
Weathered sandstone fragment
Quartz-rich sandstone (compositionally uncertain)
sedimentary
Rock crystal quartz fragment
Quartz (silicon dioxide, SiO₂)
mineral
Emerald
Beryl (Be3Al2(SiO3)6) with Chromium/Vanadium impurities
gemstone
Quartz-rich rock, possibly milky quartz or quartzite
Quartz (silicon dioxide, SiO₂); if granular and foliated, likely quartzite
mineral
Milky Quartz
Silicon Dioxide (SiO2)
mineral
Quartz Geode Fragment
Silicon Dioxide (SiO2)
mineral
Quartz Pebble (Geode Fragment / Druzy Cavity)
Silicon Dioxide (SiO2)
mineral
Sedimentary Breccia
Clastic Breccia (CaCO3/SiO2 matrix)
sedimentary
Vesicular Basalt (Scoria)
Extrusive Mafic Igneous Rock (primarily Plagioclase Feldspar and Pyroxene)
igneous
Sandstone
Clastic Sedimentary Rock
sedimentary
Orange Quartzite / Carnelian Agate
Silicon Dioxide (SiO2)
metamorphic
Pink Granite
Phaneritic Felsic Igneous Rock
igneous
Sandstone
Clastic sedimentary rock (Quartz arenite)
sedimentary
Dalmatian Stone
Peralkaline Feldsphathic Igneous Rock
igneous
Pink Granite
Phaneritic Felsic Igneous Rock
igneous
Possible weathered iron-rich rock or slag fragment
Indeterminate; likely limonite/goethite-bearing material, possibly iron slag
mineral
Weathered iron-rich rock, possibly laterite or limonite-bearing stone
Hydrated iron oxides/hydroxides, chiefly limonite-goethite mixture; exact identification requires testing
mineral
Likely weathered sandstone fragment
Sandstone, chiefly quartz (SiO₂) with feldspar and iron-oxide cement
sedimentary