Mineral Structure

Amygdaloidal Basalt with Epidote/Chlorite

Basalt (containing (Ca2(Al2Fe3+)(SiO4)(Si2O7)O(OH)))

Garden Quartz (Shaman Quartz)

Silicon Dioxide (SiO2) with various inclusions (Hematite, Chlorite, Feldspar)

Garden Quartz (Lodalite)

Silicon Dioxide with various mineral inclusions (SiO2)

Gneiss

Gneiss (High-grade regional metamorphic rock)

Nephrite Jade

Ca2(Mg,Fe)5Si8O22(OH)2

Druzy Quartz Geode (likely Smokey Quartz variety)

Silicon Dioxide (SiO2) - specifically a geode formation lined with druzy quartz crystals, with a likely brownish hue indicating smokey quartz.

Desert Rose

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

Fuchsite

Chromium-rich Muscovite (K(Al,Cr)2(AlSi3O10)(OH)2)

Desert Rose (also known as Sand Rose)

Gypsum (CaSO4·2H2O) or Barite (BaSO4) with sand inclusions

Milky Quartz

Silicon Dioxide (SiO2)

Tiger's Eye

Silicon Dioxide (SiO2)

Pegmatite

Pegmatitic Granite

Ferruginous Quartz (Iron-stained Quartz)

Silicon Dioxide with Iron Oxide (SiO2 + Fe2O3)

Vesicular Basalt with Lichen

Vesicular Basalt

Epidote in Basalt

Epidotized Basalt (Ca2(Al2,Fe)(SiO4)(Si2O7)O(OH) in Mafic Igneous Host)

Banded Gneiss

Gneiss (pronounced 'nice')

Labradorite

Labradorite (a variety of Plagioclase Feldspar), Na(AlSi3O8) to Ca(Al2Si2O8)

Vesicular Basalt

Amygdaloidal Basalt (Mafic extrusive volcanic rock)

Greenschist (Chlorite Schist)

Greenschist (containing chlorite, actinolite, and epidote)

Bronzite

MgSiO3 (Enstatite with 10-30% FeSiO3 in solid solution)

Basalt with Epidote (Greenstone)

Amygdaloidal Basalt (Ca2(Al, Fe)3(SiO4)3(OH) inclusions)

Limonite (Iron Ore)

Limonite (FeO(OH)·nH2O)

Limonite (Yellow Ochre)

Hydrated iron(III) oxide-hydroxides (FeO(OH)·nH2O)

Sandstone (with potential mineral staining/concretions)

Arenite (SiO2 based)

Limonite (with Pyrite)

Limonite (Hydrated Iron Oxide) - FeO(OH)·nH2O

Tiger's Eye

Pseudomorph of Quartz after Crocidolite (SiO2)

Red Sandstone

Arenite (Ferruginous Sandstone)

Limonite with Trace Fossils

Hydrous Iron Oxide Mixture (FeO(OH)·nH2O)

Obsidian

Volcanic Glass (SiO2)

Amygdaloidal Basalt

Vesicular-Amygdaloidal Basalt (Mafic Extrusive)

Ferruginous Quartz

Silicon Dioxide (SiO2) with iron oxide inclusions (Limonite/Goethite)

Obsidian

Amorphous volcanic glass (70-75% SiO2)

Epidote

Epidote | Ca2(Al2,Fe3+)(SiO4)(Si2O7)O(OH)

Quartz Geode

Silicon Dioxide (SiO2) in a concretionary structure

Quartz Geode (Citrine or Iron-stained Quartz)

Silicon Dioxide (SiO2)

Limonite (Ironstone)

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

Quartz (Milky Quartz)

Silicon Dioxide (SiO2)

Basalt

Mafic Volcanic Rock (composed of plagioclase, pyroxene, and olivine)

Limonite (Yellow Ochre)

Limonite (an amorphous mixture of hydrated iron oxides, primarily FeO(OH)·nH2O)

Limonite (Iron Ore)

Hydrated Iron(III) Oxide-Hydroxide (FeO(OH)·nH2O)

Nephrite Jade

Nephrite

Banded Gneiss (River Rock/Pebble)

Gneiss (specifically a banded variety often found as a river rock)