Mineral Structure

Amygdaloidal Basalt with Epidote/Chlorite

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

Likely black obsidian

Volcanic glass; composition broadly rhyolitic (silica-rich), with no crystalline mineral structure

Garden Quartz (Shaman Quartz)

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

Druzy Quartz (Botryoidal)

Silicon Dioxide (SiO2)

Garden Quartz (Lodalite)

Silicon Dioxide with various mineral inclusions (SiO2)

Polished labradorite cabochon

Labradorite, a plagioclase feldspar: (Ca,Na)(Al,Si)₄O₈

Gneiss

Gneiss (High-grade regional metamorphic rock)

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

Desert Rose (also known as Sand Rose)

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

Nephrite Jade / Epidote Pebble

Ca2(Mg,Fe)5Si8O22(OH)2 / Ca2Al2Fe3+(SiO4)(Si2O7)O(OH)

Amazonite

Microcline (KAlSi3O8) with Pb trace impurities

Jasper

Silicon Dioxide (Microcrystalline Quartz, $SiO_2$)

Nephrite Jade

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

Fossiliferous limestone (likely containing shell fossils)

Calcite-rich limestone, chiefly CaCO₃; visible fossils are uncertain from the image

Chrysocolla-bearing copper ore

Chrysocolla (hydrated copper aluminum silicate), likely with malachite/azurite and copper sulfides

Fuchsite

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

Blue sodalite-rich rock (likely sodalite syenite)

Sodalite, Na₈(Al₆Si₆O₂₄)Cl₂, in a sodalite-bearing igneous rock

Epidosite

Epidosite (Metasomatic calcium-aluminum silicate rock)

Snowflake Obsidian

Volcanic Glass (SiO2 with Cristobalite inclusions)

Pegmatite

Pegmatitic Granite

Tiger's Eye

Silicon Dioxide (SiO2)

Milky Quartz

Silicon Dioxide (SiO2)

Tumbled orbicular granite

Granite, predominantly potassium feldspar, plagioclase, quartz, and biotite/hornblende

Ferruginous Quartz (Iron-stained Quartz)

Silicon Dioxide with Iron Oxide (SiO2 + Fe2O3)

Vesicular Basalt with Lichen

Vesicular Basalt

Labradorite

Plagioclase Feldspar ((Na,Ca)(Al,Si)4O8)

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)

Weathered pale-blue rock fragment

Unidentified; the image does not show enough detail for a reliable geological identification

Small rounded pebble (rock type indeterminate)

Unidentified lithic pebble; specific composition cannot be determined from the image

Weathered rock pebble, possibly quartz-rich sandstone

Uncertain from the image; likely quartz-bearing sandstone with iron-oxide staining

Pearl

Nacre (aragonite, CaCO₃, in a conchiolin matrix)

Vesicular Basalt

Amygdaloidal Basalt (Mafic extrusive volcanic rock)

Bronzite

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

Fossil shark tooth

Fossilized shark tooth, composed mainly of apatite (carbonate fluorapatite)

Granite River Pebbles

Granite (Phaneritic Quartz-Feldspar Plutonic Rock)

Greenschist (Chlorite Schist)

Greenschist (containing chlorite, actinolite, and epidote)

Granite River Pebble

Granite

Basalt with Epidote (Greenstone)

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

Fossiliferous Limestone / Petrifaction

Sedimentary rock with fossil inclusions / Calcium Carbonate (CaCO3)