Mineral Like Biological Tissue

Red Jasper with Quartz

Silicon Dioxide (SiO2) with Hematite impurities

Malachite

Copper carbonate hydroxide [Cu2CO3(OH)2]

Ruby / Pink Sapphire

Corundum (Al2O3 with Chromium impurities)

Greenschist

Greenschist (Major minerals include Chlorite, Actinolite, and Epidote)

Copper Ore (Malachite and Limonite bearing)

Cuprite, Malachite, and Limonite mixture

Vesicular Basalt

Vesicular Basalt (Aphanitic Mafic Rock)

Crushed Stone (Gravel/Aggregates)

Crushed rock aggregate (varied composition including Granite, Limestone, and Quartz)

Potassium Feldspar (Orthoclase)

Orthoclase (KAlSi3O8)

Black Obsidian

Volcanic Glass (Silicon Dioxide with impurities)

Gneiss

Gneiss

Red Sandstone

Arenite (Iron-rich)

Quartz Geode

Silicon Dioxide (SiO2)

Petrified wood

Silicified fossil wood; commonly quartz (SiO₂) replacing wood

Tree Agate

Dendritic Agate (Silicon Dioxide - SiO2)

Greenstone (Greenschist)

Greenschist facies rock (containing chlorite, epidote, actinolite)

Prehnite

Prehnite (Ca2Al(AlSi3O10)(OH)2)

Gneiss with Iron Staining and Sulfide Mineralization

Metamorphic Gneiss / Amphibolite with Iron/Sulfide Oxidation

Obsidian

Obsidian (Volcanic Glass, SiO2 + impurity)

Blue Quartzite

Silicon Dioxide (SiO2) with inclusions

Sandstone (specifically Banded Sandstone)

Clastic sedimentary rock (primarily SiO2)

Flower Agate (Cherry Blossom Agate)

Chalcedony (SiO2) with Opaque Inclusions

Obsidian

Volcanic glass (high silica volcanic rock)

Quartz Geode

Silicon Dioxide (SiO2)

Limonite

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

Sandstone (with Concretion)

Arenite / Quartzose Sandstone

Gneiss

Gneiss

Septarian Nodule (Pebble)

Septarian concretion (composition: CaCO3, calcite, aragonite, and clay/mudstone)

Limonite Sandstone

Ferruginous Sandstone (Hydrated Iron Oxide)

Schist

Schist (Metamorphic Rock)

Quartz Geode

Silicon Dioxide (SiO2)

Greenstone or Epidote-rich Metamorphic Rock

Chlorite/Epidote Schist or Greenstone

Muscovite Mica

Muscovite (KAl2(AlSi3O10)(F,OH)2)

Banded Gneiss

Gneiss (SiO2-rich metamorphic rock)

Limonite (Ironstone) pseudomorph

Limonite (Hydrous ferric oxide), FeO(OH)·nH2O

Greenstone

Metamorphosed Mafic Igneous Rock

Quartz Pebble (with Mica or Iron staining)

Silicon Dioxide (SiO2)

Greenschist (containing Epidote and Quartz)

Greenschist (Epidote-Chlorite-Actinolite Schist)

Jasper with Hematite inclusions

Silicon Dioxide (SiO2) with Iron Oxide (Fe2O3)

Amygdaloidal Basalt

Vesicular Basalt with Amygdules

Banded Quartzite or Gneissic Pebble

Quartzite with mafic inclusions (SiO2) or Banded Gneiss

Sodalite

Sodalite (Na8(Al6Si6O24)Cl2)

Red Vanadinite on Matrix

Vanadinite (Pb5(VO4)3Cl)