Mineral, Specifically A Rock Fragment

Ruby (Pinkish-Red)

Corundum (Al2O3 with Chromium trace)

Unidentified dark mineral/rock fragment

Indeterminate; appearance may fit a sulfide-bearing rock or iron-rich mineral

Jasper (specifically Yellow or Bumblebee-like Jasper)

Silicon Dioxide (SiO2) with impurities

Basalt (with possible alteration or lichen)

Mafic volcanic rock (primarily Plagioclase and Pyroxene)

Granite fragment (tentative)

Granite; primarily quartz (SiO₂), feldspar, and mica

Dark gray, fine-grained rock fragment (possibly basalt)

Basalt (tentative identification; image alone cannot confirm)

Small tumbled orange-brown mineral fragment

Indeterminate; possibly iron-stained quartz, carnelian, or orange calcite

Possible granite or granitic rock fragment

Unidentified granitoid; precise identification is not possible from this small image

Chert (specifically Green Chert/Jasper)

Silicon Dioxide (SiO2) - Microcrystalline Quartz

Drupa or Druzy Quartz on Geode Fragment

Crystalline Silicon Dioxide (SiO2)

Sandstone with Iron Banding

Arenite with Hematite or Limonite staining (SiO2 with Fe2O3)

Quartz fragment

Quartz (silicon dioxide, SiO₂)

Pale green-gray stone, possibly serpentinite

Serpentinite (rock composed mainly of serpentine-group minerals)

Milky Quartz

Silicon Dioxide (SiO2)

Milky Quartz

Quartz (Silicon Dioxide, SiO2)

Likely amethyst (purple quartz) fragment

Quartz, SiO₂; purple variety colored by trace iron and irradiation

Breccia

Breccia

Geode Nodule Fragment

Quartz / Chalcedony Nodule

Granite fragment

Granite (Felsic intrusive igneous rock)

Milky Quartz

Silicon Dioxide (SiO2)

Sandstone and Conglomerate pebbles

Sedimentary clastic rock

Unidentified yellow-orange mineral fragment

Possibly iron-stained quartz, calcite, or citrine; identification is uncertain from the image

Quartz Geode / Druzy Quartz

Silicon Dioxide (SiO2)

Conglomeratic gravel / polymictic breccia

Polymictic rudite, likely anthropogenic or beach/stream gravel; composition varies

Small rounded quartz pebble

Quartz (SiO₂), possibly milky quartz

Pink Granite

Granite (Phaneritic igneous rock rich in Alkali Feldspar and Quartz)

Green sea glass (likely)

Anthropogenic glass, not a mineral; composition commonly soda–lime silicate glass

Sandstone Concretion

Moqui Marble / Ironstone Concretion (Iron oxide-cemented sandstone)

Shale

Lutaceous Rock (Hydrous Aluminum Silicates)

Gravel

Unconsolidated rock fragments / detrital sediment

Blue Lace Agate

Silicon dioxide (SiO2) - Chalcedony variety

Calligraphy Stone

Fossiliferous Stromatolite Limestone (also known as Arabic Script Stone, Miriam Stone, or Elephant Skin Jasper)

Quartz-rich rock fragment

Likely quartz vein material, predominantly quartz (SiO₂); identification is tentative from the image

Small banded metamorphic rock fragment

Indeterminate foliated metamorphic rock; possibly mica schist or gneiss

Weathered granitic rock fragment

Granite, predominantly quartz–feldspar–mica assemblage

Basalt (Tumbled Massage Stone)

Extrusive Igneous Rock

Seashell Fragment

Calcium Carbonate (CaCO3) in the form of Aragonite or Calcite

Agate (specifically Chalcedony/Banded Agate)

Silicon Dioxide (SiO2)

Unidentified gray stone

Likely quartz-rich stone; exact identification is not possible from the image

Gray stone fragment

Unidentified fine-grained gray rock; exact identification is not possible from the image

Moss Agate

Chalcedony (Silicon Dioxide / SiO2)

Unidentified dark rock fragment

Likely fine-grained mafic mineral aggregate; exact identification requires testing