Mineral Like Biological Tissue

Clear Quartz

Quartz (Silicon Dioxide - SiO2)

Clear Quartz Crystal

Silicon Dioxide (SiO2)

Amethyst

Amethyst (SiO2 - Silicon Dioxide with iron impurities)

Clear Quartz (Rock Crystal)

Silicon Dioxide (SiO2)

Clear Quartz (Rock Crystal)

Silicon Dioxide (SiO2)

Clear Quartz

Silicon Dioxide (SiO2)

Clear Quartz

Silicon Dioxide (SiO2)

Clear Quartz (Rock Crystal)

Silicon Dioxide (SiO2)

Quartz Pebble

Silicon Dioxide (SiO2)

Quartz Sand Grain

Silicon Dioxide (SiO2)

Yellow Quartz (Iron-Stained Quartz)

Silicon Dioxide (SiO2) with iron oxide inclusions

Quartz (Smoky/Milky variant)

Silicon Dioxide (SiO2)

Quartz

Silicon dioxide (SiO2)

Limonite Pseudomorph after Pyrite

Limonite (Hydrous iron oxides, FeO(OH)·nH2O) replacing Pyrite (FeS2)

Chert (specifically Jasper/Carnelian Agate)

Microcrystalline Quartz (SiO2)

Sandstone

Arenite (composed primarily of SiO2)

Chrysocolla

Hydrated copper phyllosilicate (Cu,Al)2H2Si2O5(OH)4 nH2O

Jasper with Agate Inclusions

Silicon Dioxide (SiO2)

Glauconitic Sandstone (Greensand)

Glauconitic Quartz Arenite (containing Glauconite, (K,Na)(Fe3+,Al,Mg)2(Si,Al)4O10(OH)2)

Sandstone

Arenite (primarily SiO2)

Sandstone (likely Fossiliferous)

Arenite / Fossiliferous Sandstone (SiO2 composition)

Botryoidal Chalcedony Geode

Silicon Dioxide (SiO2) - Chalcedony / Cryptocrystalline Quartz

Quartz

Quartz (SiO2)

Sandstone

Arenite (composed primarily of SiO2)

Petrified Wood

Silicified Wood (SiO2)

Nuummite

Antophyllite-Gedrite (Orthorhombic amphiboles)

Malachite and Azurite on Matrix

Cu2CO3(OH)2 (Malachite) / Cu3(CO3)2(OH)2 (Azurite)

Banded Chalcedony (Agate)

Chalcedony (SiO2) - Cryptocrystalline Quartz

Rose Quartz

Silicon Dioxide (SiO2) with trace amounts of titanium, iron, or manganese

Desert Rose (Baryte or Selenite variant)

Barium Sulfate (BaSO4) or Gypsum (CaSO4·2H2O) with Sand inclusions

Gneiss

Gneiss

Quartz Geode (Cracked Open)

Quartz (Silicon Dioxide - SiO2)

Turquoise and Red Coral

CuAl6(PO4)4(OH)8·4H2O (Turquoise) and Corallium rubrum (Red Coral)

Epidote (Unakite-related)

Epidote (Ca2(Al,Fe)3(SiO4)3(OH))

Ferruginous Sandstone

Sandstone (arenite) with Limonite/Goethite cement

Chrysocolla in Jasper (Chryso-Jasper)

Cu2-xAlx(H2-xSi2O5)(OH)4·n H2O (Chrysocolla) + SiO2 (Jasper)

Arfvedsonite with Garnet

Na3(Fe2+,Mg)4Fe3+Si8O22(OH)2

Sandstone

Arenite

Moss Agate

Moss Agate (a variety of Chalcedony, SiO ₂)

Blue Chalcedony

Silicon Dioxide (SiO2)

Quartz Pebble

Silicon Dioxide (SiO2)

Amethyst

Silicon Dioxide with Iron impurities (SiO2)