Anthropogenic (Man Made Material Processed By Nature)

Barite Rose

Barium Sulfate (BaSO4)

Sandstone

Clastic Sedimentary Rock

Granite

Granite (phaneritic intrusive igneous rock consisting of quartz, feldspar, and mica)

Iron-stained Quartz

Silicon Dioxide (SiO2) with iron oxide inclusions

Red Jasper

Jasper (Silicon Dioxide, SiO2)

Quartzite

Metamorphic Quartzite

Shale

Sedimentary pelitic rock

Quartz

Quartz (SiO₂)

Banded Iron Formation

Banded Iron Formation (BIF)

Diamond

Diamond (pure Carbon, C)

Vesicular Rhyolite

Rhyolite (High-silica volcanic rock)

Quartzite Pebble

Quartzite (primarily SiO2)

Dyed Agate

SiO2

Blue Apatite

Fluorapatite / Apatite Group Ca5(PO4)3(F,Cl,OH)

Pyrite

Iron Disulfide (FeS2)

Fossilized Shell in Limestone

Biogenic Limestone (Calcium Carbonate, CaCO3)

Limonite (Iron Ore)

FeO(OH)·nH2O (Hydrated iron(III) oxide-hydroxide mixture)

Basalt

Basalt

Diamond (or Diamond Simulant)

Carbon (C) or Cubic Zirconia (ZrO2)

Rose Quartz

Silicon Dioxide (SiO2)

Jasper

Microcrystalline Quartz (SiO2) with impurities

Basalt

Basalt (Mafic volcanic rock)

Rainbow aura quartz cluster

Quartz, silicon dioxide (SiO₂), artificially coated with a thin metallic film

Diamond

C (Pure Carbon)

Quartzite

Quartzite (Metamorphosed Sandstone)

Basalt

Basalt (containing plagioclase, pyroxene, and olivine)

Milky Quartz

Silicon Dioxide (SiO2)

Diamond

Native Carbon (C)

Quartzite

Metamorphic Quartzite (SiO2)

Yellow Jasper

Silicon Dioxide (SiO2) with iron hydroxides (goethite)

Banded iron formation fragment (likely hematite–magnetite ironstone)

Banded iron formation; chiefly hematite (Fe₂O₃), magnetite (Fe₃O₄), and microcrystalline quartz (SiO₂)

Shale (or Mudstone)

Clay mineral aggregate / Fine-grained siliciclastic sedimentary rock

Carved Stone Turtle

Mixed stone carving

Emerald

Beryl, Be₃Al₂(SiO₃)₆, colored green mainly by chromium and/or vanadium

Pebble (likely a type of sandstone or quartzite pebble)

Clastic Sediment (specifically, a rudite-sized clast). If the pebble is composed of a specific rock type, its scientific name would be that rock type (e.g., 'Quartzite pebble', 'Granite pebble', 'Chert pebble'). Given its appearance, it is likely a metamorphic quartzite pebble or a hard sandstone pebble.

Jasper with Dendritic Inclusions

Silicon Dioxide (SiO2) - Microcrystalline Quartz

Banded Jasper

Silicon Dioxide (SiO2) with impurities

Chert (often referred to as 'Jasper' when red)

Chert (microcrystalline quartz, SiO₂)

Limestone

Sedimentary Rock (Primarily CaCO3)

Pyrite-bearing Rock / Pyrite Ore

Iron Sulfide (FeS2) in host rock matrix

Pyrite

Iron Sulfide (FeS2)

Placer Gold Nugget

Native Gold (Au)