Not A Rock Or Mineral (Anthropogenic Material)

Red bead-and-chain costume jewelry, likely glass or plastic

No geological identification; the red beads appear manufactured and cannot be identified as mineral from the image

Greenstone (likely chlorite- or epidote-rich metamorphic rock)

Greenstone; commonly metamorphosed basalt or dolerite, with chlorite, epidote, and actinolite

Granite or Pegmatite in host rock

Granitoid / Felsic Intrusive Rock

Opalite-style glass pendant

Man-made opalescent glass (not natural opal)

Sandstone

Clastic Sedimentary Rock

Moonstone

Orthoclase (Potassium Aluminum Silicate), Formula: (K,Na)AlSi3O8

Petrified Wood

Silicified Wood (Silicon Dioxide - SiO2)

Gneiss (rounded cobble)

Quartz–feldspar–mica gneiss; exact mineral proportions cannot be determined from the image

Slag Glass

Amorphous Silica / Glass Slag

Sandstone

Clastic Sedimentary Rock

Slag (Anthropogenic Glass/Iron byproduct)

Ferro-silicate Slag

Sandstone

Sedimentary Rock (Quartz arenite/Arkose)

Mixed gravel and small stones

Unsorted gravel; individual clasts are not identifiable from the image

Likely blue-gray gneiss

Gneiss, a foliated metamorphic rock; exact mineral composition cannot be confirmed from the image

Sandstone

Clastic Sedimentary Rock

White pebbles (rock material not identifiable from the image)

Undetermined; the smooth, pale pieces could be quartz, quartzite, or another light-colored rock

Polished brecciated jasper

Jasper, an opaque microcrystalline variety of chalcedony (SiO₂), with iron-oxide staining

Small brown pebble or possible shell fragment

Unidentified natural clast; the image is too small and blurred for reliable identification

Sandstone

Arenite

Sandstone

Arenite (primarily SiO2)

Sandstone

Arenite (SiO2 with various cementing minerals)

Likely bituminous coal

Coal, predominantly carbon-rich organic matter; exact rank cannot be confirmed from the image

Gravel or Crushed Stone

Fragmented Aggregate Stone

Quartz with Sericite and Cinnabar

Silicon Dioxide (SiO2) with muscovite/sericite and mercury sulfide (HgS)

Weathered iron-rich rock, possibly limonite-bearing basalt or laterite

Indeterminate; likely Fe-oxide/hydroxide–altered mafic rock, dominated by limonite/goethite with silicate minerals

Sandstone

Sedimentary Clastic Rock

Sandstone (with potentially high Feldspar/Arkose content)

Clastic sedimentary rock (SiO2 dominated)

Sandstone Pebble

Sandstone (primarily SiO2)

Dendritic jasper/chalcedony

Silica-rich microcrystalline quartz (SiO₂) with manganese-oxide dendrites

Quartz Vein in Siltstone

SiO2 (Quartz) on clastic sedimentary matrix

Tumbled leopard-skin jasper (probable)

Orbicular rhyolite/jasper; primarily microcrystalline quartz (SiO₂) with feldspar and iron-oxide inclusions

Quartz-rich rock fragment

Unidentified quartz–feldspar-rich rock; exact lithology cannot be determined from the image

Polished stone clock face, likely agate or jasper

Unconfirmed silica-rich material; possibly banded chalcedony (SiO₂)

Sandstone

Clastic Sedimentary Rock

Sedimentary Rock with Crafts (Pet Rock)

Sedimentary rock decorated with synthetic materials

Smooth gray pebbles

Unidentified rounded rock fragments; composition cannot be determined from the image

Lazulite Quartzite

Quartzite with Lazulite (SiO2 with (Mg,Fe)Al2(PO4)2(OH)2)

Jasper and Epidote in Quartzite

Metamorphic rock containing microcrystalline quartz, epidote, and jasper

Red Sandstone

Arenite (SiO2 with Fe2O3)

Quartz Vein in Siltstone

Silicon Dioxide (SiO2) within Sedimentary/Metamorphic Matrix

Likely bituminous coal

Coal, predominantly carbon-rich organic matter with variable maceral and mineral content

Sandstone

Clastic sedimentary rock