Mineral, Specifically A Rock Fragment

Generic Pebble / Small Rock Fragment

Lithic fragment / Weathered rock particle

Pink Granite

Granite (Phaneritic Quartz-Feldspar rock)

Likely weathered quartz-bearing rock fragment

Indeterminate; appears to contain quartz (SiO₂) with iron-oxide staining, possibly from quartzite, granite, or pegmatite

Smoky Quartz

Silicon Dioxide (SiO2) with aluminum impurities

Fossilized tooth, likely a mammalian tooth fragment

Indeterminate fossil tooth; possibly an ungulate or carnivoran tooth

Quartz Geode Fragment

Silicon Dioxide (SiO2)

Quartz Heart or Arrowhead Shape

Silicon Dioxide (SiO2)

Unknown brown-and-gold rock fragment

Undetermined; possibly iron-stained quartz, mica schist, or sulfide-bearing ore

Fossil bivalve or brachiopod in sedimentary rock

Unidentified fossil shell impression; likely a ribbed bivalve or brachiopod preserved in shale/siltstone

Concrete Fragment

Hardened Portland Cement Composite

Blue Topaz

Aluminum Silicate Fluoride Hydroxide - Al2SiO4(F,OH)2

Quartz Geode Fragment

Silicon Dioxide (SiO2)

Sandstone

Arenite (specifically Quartz Arenite)

Possible weathered metal-rich rock or slag fragment

Uncertain; possibly iron-oxide-rich breccia or industrial slag

Chert (specifically Yellow Jasper variety)

Silicon Dioxide (SiO2)

Druzy Quartz (part of a Geode)

Silicon Dioxide (SiO2)

Small quartz-rich rock fragment (tentative)

Likely quartz (SiO₂) with possible feldspar or carbonate inclusions

Gravel and Sand Aggregate

Unconsolidated Clastic Sediment

Agate (specifically Chalcedony/Banded Agate)

Silicon Dioxide (SiO2)

Sandstone Concretion

Ferruginous Sandstone Concretion

Quartz

Silicon Dioxide (SiO2)

Banded Agate (specifically Crazy Lace Agate style)

Silicon Dioxide (SiO2) - Microcrystalline Quartz

Green Aventurine

Quartz (Silicon Dioxide, SiO2) with fuchsite inclusions

Yellow-green jasper or serpentine-rich rock

Likely microcrystalline quartz (SiO₂) with iron-bearing and/or serpentine minerals; exact identification requires testing

Brecciated Red Jasper

Silicon Dioxide (SiO2) with Hematite impurities

Sandstone

Arenite (specifically Quartz Arenite)

Amethyst (Rough)

Silicon Dioxide with iron impurities (SiO2)

Fossilized Bryozoan

Bryozoa

Cobalt Blue Sea Glass

Amorphous Silica Glass (SiO2 + CoO)

Tiny amber-colored crystal fragment

Indeterminate; possibly quartz, feldspar, mica, or a sulfide mineral

Weathered quartz-rich rock fragment

Indeterminate; possibly weathered granite, quartzite, or rhyolite

Yellow Quartz (Citrine or Iron-Stained Quartz)

Silicon Dioxide (SiO2)

Small gray rock fragment, likely granite or diorite

Uncertain; probable coarse-grained silicate rock dominated by feldspar and quartz, possibly biotite/hornblende

Quartz Druzy (Geode Fragment)

Silicon Dioxide (SiO2)

Likely weathered metallic mineral or slag fragment

Indeterminate; possibly iron-rich sulfide/oxide material or industrial slag

Quartz-rich gravel fragment

Quartz (silicon dioxide, SiO₂), possibly with feldspar or carbonate inclusions

Quartz Druzy (Geode Fragment)

Silicon Dioxide (SiO2)

Nuummite

Nuummite (ortho-amphibole rock)

Pyrite-rich Ore

Pyrite (FeS2) with secondary minerals

Emerald in Matrix

Beryl (Be3Al2Si6O18) with Chromium/Vanadium impurities

Concretion

Sedimentary Concretion (Ironstone / Calcite Concretion)

Milky Quartz

Quartz (Silicon Dioxide, SiO2)