Metamorphic Or Igneous Alteration

Epidote (Greenstone)

Calcium aluminum iron silicate hydroxide Ca2(Al2,Fe)(SiO4)(Si2O7)O(OH)

Blue Sapphire

Corundum (Al2O3)

Epidote (likely Unakite component or Epidosite)

Epidote (Ca2(Al2Fe)(SiO4)(Si2O7)O(OH))

Orthoclase Feldspar

Orthoclase (KAlSi3O8)

Specular Hematite

Iron(III) oxide (Fe2O3)

Hematite

Iron Oxide (Fe2O3)

Biotite (Mica)

K(Mg,Fe)3AlSi3O10(OH,F)2

Peach Moonstone

Potassium Aluminum Silicate (KAlSi3O8)

Hematite

Iron(III) oxide (Fe2O3)

Epidote (Greenstone)

Epidote (Ca2(Al2,Fe)(SiO4)(Si2O7)O(OH))

Nephrite Jade

Tremolite-Actinolite solid solution Ca2(Mg,Fe)5Si8O22(OH)2

Hematite

Iron(III) oxide (Fe2O3)

Serpentine

Serpentine group ((Mg,Fe,Ni,Al,Zn,Mn)3(Si,Al)2O5(OH)4)

Mixed Mineral Specimens

Mixed Silicates, Oxides, and Phosphates (SiO₂, Ca₅(PO₄)₃(F,Cl,OH), Na₈Al₆Si₆O₂₄Cl₂, etc.)

Unakite

Unakite Epidosite (Granite with epidote and orthoclase)

Magnetite-rich ironstone (probable magnetite ore)

Magnetite, Fe₃O₄, likely in a fine-grained ironstone matrix

Dearest Ring (Gemstones)

Mixed Gemstones: Diamond (C), Emerald (Be3Al2Si6O18), Amethyst (SiO2), Ruby (Al2O3), Sapphire (Al2O3), Topaz (Al2SiO4(F,OH)2)

Epidote

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

Greenstone

Metabasalt / Chlorite-actinolite-epidote schist

Greenstone Pebble

Metabasalt / Greenstone

Quartz-rich metamorphic rock (probable quartzite)

Quartzite; predominantly crystalline SiO₂, with possible mica and iron-oxide impurities

Milky Quartz

Silicon Dioxide (SiO2)

Corundum (Sapphire in Matrix)

Aluminum Oxide (Al2O3)

Emerald in Matrix

Beryl (Be3Al2Si6O18)

Orange Aventurine (or Tumbled Carnelian)

Quartz (SiO2) with inclusions

Epidote

Epidote - Ca2(Al2,Fe3+)3(SiO4)3(OH)

Epidote

Epidote ({Ca2}{Al2Fe3+}(Si2O7)(SiO4)O(OH))

Green Aventurine

Silicon Dioxide (SiO2) with Chromium-rich Fuchsite mica

Ruby (Raw Corundum)

Alumina (Al2O3) with Chromium traces

Epidote in Matrix

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

Nephrite Jade

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

Fossil shell or shell fragment

Likely a calcareous bivalve or gastropod fragment; precise identification requires locality and microscopy

Serpentine (Serpentinite)

Serpentinite / Antigorite-Lizardite group (Mg,Fe)3Si2O5(OH)4

Epidosite

Epidosite (consisting primarily of Epidote Ca2(Al2,Fe3+)(SiO4)(Si2O7)O(OH) and Quartz SiO2)

Serpentine (Serpentinite egg)

Serpentinite / Antigorite-Lizardite rock (Mg3Si2O5(OH)4)

Botryoidal Prehnite

Prehnite (Ca2Al(AlSi3O10)(OH)2)

Sugilite

KNa2(Fe,Mn,Al)2Li3Si12O30 (Potassium Sodium Lithium Iron Manganese Aluminum Silicate)

Hematite

Iron(III) oxide (Fe2O3)

Unakite

Unakite (Epidotized Granite)

Mica (Muscovite) in Granite

Muscovite (KAl2(AlSi3O10)(OH)2)

Hematite

Iron Oxide (Fe2O3)

Hematite

Iron Oxide (Fe2O3)