Sedimentary Rock (Possibly Composed Of Various Minerals)

Bloodstone

Chalcedony (Quartz)

Rounded chert or chalcedony pebble

Microcrystalline quartz (SiO₂), possibly silicified limestone or agate-like chalcedony

Granite

Intrusive igneous rock composed mainly of quartz, alkali feldspar, and plagioclase

Apatite

Apatite Group (e.g., Fluorapatite Ca5(PO4)3F, Chlorapatite Ca5(PO4)3Cl, Hydroxylapatite Ca5(PO4)3(OH))

Fossil Snail

Gastropoda (fossilized)

Likely quartz-rich rock fragment

Probably microcrystalline quartz (SiO₂), possibly a pale chert or quartzite fragment

Quartz-Veined Slate or Greenstone

Metamorphic rock with quartz vein (SiO2)

Quartz Druze (on Matrix)

Silicon Dioxide (SiO2)

Ferruginous Sandstone

Sandstone with iron oxide (Hematite/Limonite) cement

Chalcedony Geode

Chalcedony (SiO2) within a geode structure

African Turquoise (Jasper)

Polychrome African Jasper (often marketed as 'African Turquoise' due to its color, but it is not true turquoise)

Yellow Jasper

Silicon Dioxide (SiO2) with iron oxide inclusions

Basalt

Mafic volcanic rock (various silicate minerals including Pyroxene and Plagioclase)

Red Jasper

Jasper (Silicon Dioxide with iron oxide inclusions), SiO2

Jasper with Iron Staining

Silicon Dioxide (SiO2) with Iron Oxide (Fe2O3) impurities

Likely iron-rich slag or weathered ironstone

Hematite–goethite-rich material (Fe₂O₃/FeO(OH)); possibly industrial iron slag

Yellow Calcite

Calcium Carbonate (CaCO3)

Granite

Granite

Jasper

Microcrystalline Quartz (SiO2)

Banded Sedimentary Rock

Stratified Siliciclastic / Arenite or Siltstone with Mineral Bands

Granite

Felsic Plutonic Igneous Rock

Polished black agate slice

Chalcedony (microcrystalline quartz), SiO₂, with iron/manganese staining

Fossilized Shark Tooth

Fossil Chondrichthyes (various genera such as Carcharias or Odontaspis)

Chert / Flint Nodular Fragment

Microcrystalline quartz (SiO2)

Quartz-rich metamorphic rock, possibly quartzite

Quartzite; primarily crystalline silicon dioxide (SiO₂), with minor feldspar, mica, or iron oxides

Vein Quartz in Basalt or Chert

Silica-veined dark lithic rock (Quartz veins in microcrystalline matrix)

Fluorite in Matrix

Fluorite (CaF2) within a host rock matrix

Conglomerate

Conglomeratic Sandstone

Clear Quartz

Silicon Dioxide (SiO2)

Quartz-rich river pebble, likely milky quartz

Milky quartz (SiO₂), possibly a quartzite or quartz-rich silicate pebble

Granitic Pegmatite

Coarse-grained Granite (KAlSi3O8 + SiO2)

Pink Rhodonite

Manganese Silicate (MnSiO3)

Calcite

Calcite (Calcium Carbonate, CaCO3)

Quartzite

Quartzite (chiefly SiO2)

Coal

Bituminous Coal (organic sedimentary rock)

Likely basalt

Basalt; fine-grained mafic volcanic rock composed mainly of plagioclase, clinopyroxene, and often olivine

Quartz Pebble

Silicon dioxide (SiO2)

Septarian Nodule (or Mudstone with Septarian Cracking)

Septarian Concretion (Composition: Calcite, Aragonite, and Limestone/Claystone)

Likely quartz fragment

Quartz (silicon dioxide, SiO₂), possibly milky quartz or quartz-rich rock

Greenstone / Serpentinite

Serpentinite (composed largely of Serpentine group minerals, Mg3Si2O5(OH)4)

Rough Diamond (Bort)

Diamond (C)

Mammoth or Mastodon Tooth Fragment

Mammuthus / Mammut molar fragment