Metamorphic Or Igneous Alteration

Muscovite (White Mica)

Muscovite - Potassium aluminum silicate: KAl2(AlSi3O10)(F,OH)2

Likely basaltic or mafic metamorphic rock

Fine-grained mafic rock, probably basalt or altered basalt; composition mainly plagioclase and pyroxene, possibly chlorite/epidote

Sapphire (Blue/Violet Rough)

Corundum (Al2O3)

Milky quartz-bearing rock

Quartz (SiO₂), likely massive quartz with minor iron-oxide inclusions

Bull Quartz with Mica and Host Rock

Massive Quartz (SiO2) with Muscovite/Chlorite inclusions

Unidentified greenish mineral fragment

Possibly serpentine, prehnite, or green aventurine; species cannot be confirmed from a photograph

Green Granite / Verd Antique

Serpentinite / Metasomatized Peridotite

Oyster shell fragment

Ostreidae shell; primarily calcite (CaCO₃)

Epidosite

Epidosite (predominantly Epidote {Ca2Al2Fe3+Si3O12(OH)} and Quartz {SiO2})

Epidosite (Unakite-related)

Epidosite (predominantly Epidote, Ca2(Al2,Fe3+)(SiO4)3(OH))

Green Aventurine

Quartz with Fuchsite inclusions (SiO2)

Serpentinite

Serpentinite (Hydrated magnesium iron silicate)

Green Greenstone / Celadonite-bearing Metamorphic Rock

Greenschist / Celadonite / Serpentinitic pebble

Milky quartz (likely quartz-rich rock)

Quartz, silicon dioxide (SiO₂)

Quartz Pebble (River Agate / Chalcedony)

Silicon Dioxide (SiO2)

Blue Sapphire

Corundum (Al2O3)

Mica Sand / Vermiculite

Phyllosilicate group (typically Biotite or Muscovite)

Quartz-bearing rock fragment

Likely quartz (SiO₂) with iron-oxide staining and possible feldspar/matrix minerals

Milky Quartz

Quartz (Silicon Dioxide, SiO2)

Milky Quartz

Silicon Dioxide (SiO2)

Quartz Vein

Silicon Dioxide (SiO2)

Epidosite

Epidosite (Metasomatic calcium-aluminum silicate rock)

Hematite (Iron Ore)

Hematite (Fe2O3)

Polished dark mineral fragments, likely hematite or magnetite

Hematite (Fe₂O₃) or magnetite (Fe₃O₄)

Epidote

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

Hematite

Iron(III) oxide (Fe2O3)

Rose Quartz

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

Milky Quartz

Silicon Dioxide (SiO2)

Weathered greenish mineral specimen, possibly serpentine or epidote

Tentatively serpentine-group mineral (Mg3Si2O5(OH)4) or epidote (Ca2(Al,Fe)3Si3O12(OH)); identification is uncertain from the image alone

Weathered quartz-rich rock, possibly milky quartz in altered host rock

Milky quartz (SiO₂), with probable iron-oxide staining and a fine-grained host matrix

Hematite (Tumbled)

Iron(III) oxide (Fe2O3)

Milky Quartz

Silicon Dioxide (SiO2)

Red gemstone ring, possibly synthetic ruby or red glass

Unidentified red stone; ruby is corundum (Al₂O₃), but the image cannot confirm its identity

Likely serpentinite (serpentine-rich rock)

Serpentinite, composed mainly of serpentine-group minerals (e.g., antigorite, lizardite, or chrysotile)

Epidote

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

Raw quartz crystal/chunk

Quartz (silicon dioxide, SiO₂)

Red Aventurine (Strawberry Quartz / Sunstone Quartz)

Silicon Dioxide with Hematite/Goethite inclusions (SiO2)

Quartz-rich breccia or quartz vein fragment

Silica, primarily quartz (SiO₂), with possible chlorite, feldspar, or iron-oxide inclusions

Raw Emerald (Emerald Beryl)

Beryl (Be3Al2Si6O18) with chromium/vanadium impurities

Emerald

Beryl (Be3Al2(SiO3)6)

Orange Calcite

Calcite (CaCO3)

Raw Emerald in Matrix

Beryl (Be3Al2Si6O18) with Chromium/Vanadium impurities