Mineral, Specifically A Rock Fragment

Weathered tan mineral/rock fragment

Indeterminate from image; possibly iron-stained quartz, feldspar-rich rock, or limonite-bearing material

Granite fragment

Granite (Felsic intrusive igneous rock)

Moss-covered Rock Fragment

Weathered Rock Fragment with Epilithic Growth

Dalmatian Jasper

Feldspar porphyry (Microcline and Quartz with Arfvedsonite spots)

Generic Pebble / Rock Fragment

Lithic fragment / Weathered rock pebble

Shale fragment

Shale (Laminated Mudstone)

Quartz (likely Herkimer Diamond style)

Silicon Dioxide (SiO2)

Pallasite Meteorite

Pallasite (Stony-iron meteorite; Fe-Ni alloy with (Mg,Fe)2SiO4 olivine)

Polished brown mineral or rock fragment

Indeterminate from image; possibly iron-stained quartz, jasper, or a polished sulfide-bearing specimen

Likely weathered iron-rich breccia or jasper

Silicified iron-oxide breccia; exact identification requires testing

Pebble

Lithic fragment / Sedimentary clast

Granite / Gneiss Ballast Rock

Granite (Quartzo-feldspathic rock)

Gravel / Crushed Stone

Aggregate (mixed mineral rock fragments)

Quartz Druze on Matrix (Geode Fragment)

Quartz (Silicon Dioxide, SiO2)

Feldspar (specifically Orthoclase)

Potassium Aluminum Silicate (KAlSi3O8)

Pink Granite

Phaneritic Plutonic Rock (Felsic)

River Pebble

Siliceous rock fragment

Common Brown Pebble

Weathered Rock Fragment

Gravel / Small Pebble

Rock Fragment (Gravel)

Crazy Lace Agate

Chalcedony (SiO2) with microcrystalline quartz

Granite fragment

Felsic intrusive igneous rock; mainly quartz, alkali feldspar, plagioclase, and minor biotite/hornblende

Emerald in Matrix

Beryl (Be3Al2Si6O18)

Man-made Jewelry (Metal and Glass/Plastic)

Synthetic Alloy and Amorphous Solid (SiO2/Polymer)

Coarse Sand Grain / Lithic Fragment

Clastic Sediment (Lithic fragment or Quartz/Feldspar grain)

Oolitic Chert

Silicon Dioxide (SiO2) with Oolitic texture

Honey Calcite

Calcium Carbonate (CaCO3)

Granite fragment

Granite

Blue Slag Glass

Anthropogenic Amorphous Silicon Dioxide

Quartz Druzy

Silicon Dioxide (SiO2)

Quartz (Microcrystalline/Gravel)

Silicon Dioxide (SiO2)

Note: Item is not a geological specimen

Guitar Components (Steel, Nickel, Plastic, Wood)

Note: This is a Man-Made Object (Costume/Prop Patch)

Synthetic fiber and pigments (Cellulose/Plastic-based composite)

Sandstone (Weathered Fragment)

Clastic Sedimentary Rock

Banded Agate (Onyx type)

Silicon Dioxide (SiO2)

Green Aventurine

Quartz with Fuchsite inclusions (SiO2)

Turquoise fragment

Turquoise — hydrated copper aluminum phosphate, CuAl₆(PO₄)₄(OH)₈·4H₂O

Conical fossil shell or shell fragment

Likely a gastropod shell fragment; exact taxon indeterminate from the image

Quartz Geode Fragment

Silicon Dioxide (SiO2)

Pink Granite

Phaneritic Felsic Igneous Rock (composed primarily of K-feldspar, Quartz, and Biotite)

Quartz (Druzy or Geode fragment)

Silicon Dioxide (SiO2)

Weathered quartz-rich rock fragment

Likely quartz-bearing sandstone or granitic rock; exact identification is uncertain from the image

Quartz / Quartzite

Silicon Dioxide (SiO2)