Mineral, Specifically A Rock Fragment

Limestone with Fossil Fragment

Sedimentary carbonate rock (CaCO3)

K-Feldspar Granite Fragment

Granite (Alkali Feldspar-rich)

Amethyst

SiO2 (Silicon Dioxide with iron impurities)

Likely weathered mica schist fragment

Mica schist, chiefly muscovite/biotite mica with quartz and feldspar

Fossilized Angel Wing Shell

Cyrtopleura costata

Quartz-rich rock fragment, possibly granite or quartzite

Primarily quartz (SiO₂), with possible feldspar and iron-oxide staining

Milky Quartz

Silicon Dioxide (SiO2)

Milky Quartz

Silicon Dioxide (SiO2)

Jasper Agate (specifically Brecciated Jasper)

Silicon Dioxide (SiO2) with iron oxide and clay impurities

Quartz (Milky or Cloudy)

Silicon Dioxide (SiO2)

Quartz (Agate/Chalcedony variety)

Silicon Dioxide (SiO2)

Likely weathered quartz-bearing rock fragment

Indeterminate granitic or quartz-rich silicate rock; chiefly quartz (SiO₂), possibly feldspar

Quartz Pebble

Silicon Dioxide (SiO2)

Pink Granite

Granite (Phaneritic Igneous Rock)

Pink Granite

Granite (Alkali-feldspar granite)

Likely quartz-rich rock fragment

Quartz (SiO₂), possibly in a feldspar-bearing granite or pegmatite matrix

Quartz Geode Fragment

Silicon Dioxide (SiO2)

Quartz-rich rock fragment, likely milky quartz

Quartz (silicon dioxide, SiO₂), possibly an iron-stained quartz vein fragment

River Cobble (Quartzite or Sandstone)

Clastic sedimentary rock (primarily SiO2)

Quartz Veined Rock (Likely Graywacke or Quartzite)

Silicon Dioxide (SiO2) veins in Metasedimentary matrix

Weathered greenish rock fragment

Indeterminate; possibly epidote- or chlorite-bearing altered silicate rock

Quartz (Druzy or Crystalline)

Silicon Dioxide (SiO2)

Porphyritic Basalt (with Olivine or Quartz phenocryst)

Porphyritic Basalt (Mafic Extrusive)

Likely calcite fragment

Calcite (CaCO₃), possibly limestone or marble

Weathered sandstone

Quartz-rich sandstone (lithified arenite)

Chalcedony (Botryoidal Agate vein)

Chalcedony (Microcrystalline Quartz) - SiO2

Possible tektite or dark volcanic rock fragment

Uncertain; likely natural silicate glass (tektite) or basalt

Pink Granite

Phaneritic Felsic Igneous Rock

Hag Stone

Perforated Sedimentary Rock / Flint / Limestone

Limonitic Sandstone with Inclusion

Limonitic Quartz Sandstone (primarily SiO2 with FeO(OH)·nH2O)

Quartz Crystal Fragment

Silicon Dioxide (SiO2)

Ironstone Concretion (Coprolite-like)

Goethite/Hematite Siderite Spheroid (FeCO3 or FeO(OH))

Imperial Topaz

Al2SiO4(F,OH)2 (Fluorine-bearing Aluminum Silicate)

Weathered granite or granitic gneiss fragment

Quartz–feldspar–mica granite; possibly foliated granitic gneiss

Unknown Organic Object (likely a berry or fruit)

Not applicable; this is not a geological specimen. If it were a cranberry, its scientific name would be Vaccinium macrocarpon; if a cherry, it would be Prunus avium or Prunus cerasus.

Granite Pebble

Granite (Phaneritic intrusive igneous rock)

Orange Calcite

Calcium Carbonate (CaCO3)

Shale and Pebble Fragment

Sedimentary Rock (Mudstone/Shale with Silica Pebble)

Likely weathered quartz-rich stone

Indeterminate; possibly quartz-bearing granite or milky quartz

Quartz Geode Fragment

Silicon Dioxide (SiO2)

Boxwork Siderite or Sepatarian Nodule Weathering

Siderite (FeCO3) with secondary mineralization or Boxwork Geode fragment

Moss Agate

Silicon Dioxide with inclusions (SiO2 + Fe/Mn/Mg)