Polished orbicular jasper
Orbicular jasper; microcrystalline quartz (SiO₂) with hematite/goethite and other silicate inclusions
sedimentary
Category
Sedimentary Or Igneous (Host Environment)
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Raw greenish crystal/mineral fragment
Uncertain from image; possibly olivine (forsterite-rich), epidote, or green tourmaline
mineral
Rose Quartz
Silicon Dioxide (SiO2) with trace amounts of titanium, iron, or manganese
mineral
Peridot in Basalt
Olivine ((Mg, Fe)2SiO4) in Basalt
mineral
Tumbled sodalite
Sodalite, Na₈(Al₆Si₆O₂₄)Cl₂
mineral
Gneiss with Quartz Vein
Metamorphic Gneiss with Quartz (SiO2) and Feldspar Injection
metamorphic
Red Jasper
Silicon Dioxide (SiO2) with Hematite inclusions
sedimentary
Limestone
Calcareous sedimentary rock (CaCO3)
sedimentary
Quartz Geode Fragment
Silicon Dioxide (SiO2) in a Sedimentary Host
mineral
Quartz Vein in Host Rock
Silicon dioxide (SiO2) veining in silicate matrix
sedimentary
Quartz with Inclusions
Silicon Dioxide (SiO2)
mineral
Galena
Lead Sulfide (PbS)
mineral
Blue Apatite
Ca5(PO4)3(F,Cl,OH)
mineral
Jasper
Jasper (Silicon Dioxide, SiO2)
sedimentary
Rounded chalcedony or milky quartz pebble
Microcrystalline silica, SiO₂ (chalcedony/quartz)
mineral
Likely garnet crystal fragment
Garnet-group mineral, possibly almandine (Fe₃Al₂(SiO₄)₃)
mineral
Amethyst (Tumbled)
Silicon Dioxide (SiO2) with iron impurities
mineral
Quartz Pebble
Silicon Dioxide (SiO2)
mineral
Milky Quartz with Iron Inclusions
Silicon Dioxide (SiO2)
mineral
Argillite / Mudstone
Argillaceous sedimentary rock
sedimentary
Small rounded mineral/rock fragment
Indeterminate; possibly quartz-rich stone or feldspar
mineral
Small rough mineral/rock fragment
Indeterminate; possibly quartz-bearing rock or weathered feldspar
mineral
Pegmatite
Igneous Pegmatite
igneous
River Pebble (Greywacke or Basaltic)
Massive Greywacke or Basaltic Andesite
sedimentary or igneous
Quartz Geode (Smoky Quartz)
Silicon Dioxide (SiO2)
mineral
Banded sedimentary rock (likely sandstone or siltstone)
Layered siliciclastic sedimentary rock; exact identification is not possible from the image alone
sedimentary
Dark gray river pebble
Undetermined fine-grained mafic or intermediate rock; composition cannot be identified reliably from the image
igneous
Basalt with Quartz Vein
Extrusive Igneous Rock / Volcanic Rock
igneous
Tumbled smoky quartz (probable)
Quartz, silicon dioxide (SiO₂), smoky variety
mineral
Chert (Limestone-hosted Pebble)
Sedimentary Cryptocrystalline Quartz (SiO2)
sedimentary
Green Aventurine (Carved)
Silicon Dioxide (Quartz variant) with Fuchsite inclusions (SiO2 + K(Al,Cr)2AlSi3O(OH)2)
mineral
Gabbro or Diorite with Felsic intrusion
Mafic to intermediate intrusive igneous rock with felsic vein/inclusion
igneous
Yellow Quartz or Citrine Quartz
Silicon Dioxide (SiO2)
mineral
Carnelian
Silicon dioxide (chalcedony variety), SiO2
gemstone
Carnelian
Carnelian (Silicon Dioxide - SiO2)
mineral
Blue Chalcedony
Silicon Dioxide (SiO2)
mineral
Chert (River Pebble)
Microcrystalline Quartz (SiO2)
sedimentary
Pyrite
Iron sulfide (FeS2)
mineral
Milky quartz
Quartz (SiO₂), likely massive milky quartz with minor iron-oxide staining and inclusions
mineral
Blue Apatite
Fluorapatite (Ca5(PO4)3F)
mineral
Tumbled white quartz pebble
Quartz, silicon dioxide (SiO₂), likely milky quartz
mineral
Ruby
Corundum (Al2O3 with Chromium trace elements)
mineral