Antropogenic (Man Made Industrial Byproduct)

Quartz-veined weathered host rock

Quartz (SiO₂) in a likely altered limestone or metamorphic carbonate host

Fossil brachiopod or bivalve shell

Likely a fossilized brachiopod; precise genus cannot be determined from the photograph

Bog Iron / Limonite Concretion

Goethite/Limonite mixture (FeO(OH)·nH2O)

Epidote

Epidote (Ca2(Al2,Fe3+)3(SiO4)3(OH))

Sandstone (Quartzite-rich)

Clastic Sedimentary Rock (primarily SiO2)

Iron-rich meteorite candidate

Unclassified stony-iron or iron meteorite fragment

Iron-rich quartzite or ironstone fragment

Quartzite dominated by quartz (SiO₂), with iron oxides such as hematite/goethite

Quartz Geode Fragment

Silicon Dioxide (SiO2)

Red Jasper

Silicon dioxide (Microcrystalline Quartz, SiO2)

Polished orbicular jasper

Jasper, a microcrystalline variety of quartz (SiO₂), colored by iron oxides and other accessory minerals

Granite

Granite (felsic intrusive igneous rock)

Banded sandstone pebble

Quartz-rich sandstone, likely iron-oxide- and organic/mineral-stained; exact variety uncertain

Green Fluorite

Calcium Fluoride (CaF2)

River Stone (Limestone)

Sedimentary Calcium Carbonate (CaCO3)

Likely small metallic meteorite fragments

Unclassified iron or stony-iron meteorite; mineralogy cannot be confirmed from the image

Green Fluorite

Calcium Fluoride (CaF2)

Weathered iron-rich concretion (probable limonite/goethite)

Limonite–goethite aggregate, approximately FeO(OH)·nH₂O

Granite

Granite (Felsic Plutonic Rock)

Limestone

Calcium Carbonate (CaCO3)

Limonite (Iron Ore)

Hydrous Iron Oxide (goethite, lepidocrocite)

Granite Cobble/Pebble

Granite

Native copper (probable copper-rich mineral specimen)

Copper, Cu; possibly mixed with cuprite, malachite, and iron-oxide alteration minerals

Granite

Granite (composed primarily of Quartz, Feldspar, and Mica/Amphibole)

Granite

Granite (a common rock type, not a single mineral with a formula. Composed primarily of quartz, feldspar, and mica/amphibole).

Tumbled metallic sulfide mineral specimen, likely pyrite-bearing ore

Likely pyrite (FeS₂) with associated sulfides and host rock; exact identification requires testing

Limestone

Sedimentary Calcium Carbonate (CaCO3)

Agate (Dyed High-Grade Polished Slice)

Silicon dioxide (SiO2), Chalcedony crystal variety

Crushed Limestone

Calcium Carbonate (CaCO3)

Granite

Granite (a plutonic rock)

Chalcanthite

Hydrated copper(II) sulfate (CuSO4·5H2O)

Limestone

Sedimentary Calcium Carbonate (CaCO3)

Orange Calcite

Calcium Carbonate (CaCO3)

Green cabochon gemstone, likely aventurine or dyed chalcedony

Indeterminate from image; possible quartz variety (SiO₂), including aventurine quartz or chalcedony

Coal

Carbonaceous sedimentary rock

BROWN GRANITE (likely 'Tan Brown' or similar)

Granite (specifically a variety rich in orthoclase feldspar, often with biotite and possibly hornblende)

Granite (weathered pebble)

Granite (plutonic igneous rock)

Yellow Calcite

Calcium Carbonate (CaCO3)

Quartz pebble

Silicon dioxide (SiO2)

Sulfur

Native Sulfur (S)

Quartzite (Lithic Artifact)

Quartzite (SiO2)

Emerald

Beryl (Be3Al2Si6O18), specifically the green variety colored by chromium or vanadium

Sulfur

Native Sulfur (S)