Carnelian (Chalcedony)
Silicon Dioxide (SiO2) - Microcrystalline Quartz
mineral
Category
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Likely mica-rich schist
Mica schist, probably muscovite/biotite-bearing quartz schist
metamorphic
Amethyst Quartz
Silicon Dioxide (SiO2) with iron impurities
mineral
Hematite
Iron Oxide (Fe2O3)
mineral
Picture Jasper
Silicified sedimentary or volcanic rock (primarily SiO2)
sedimentary
Amethyst
Quartz (Silicon Dioxide, SiO2)
mineral
Moss Agate
Silicon Dioxide with inclusions (SiO2 + Mn/Fe/Chlorite)
mineral
Green Fluorite
Fluorite (Calcium Fluoride, CaF2)
mineral
Quartz (Milky/Rose variety)
Silicon Dioxide (SiO2)
mineral
Iron-rich hematite/goethite rock (ironstone)
Hematite (Fe₂O₃) with goethite/limonite (FeO(OH)·nH₂O), likely in a weathered ironstone matrix
mineral
Tumbled sodalite
Sodalite, Na₈(Al₆Si₆O₂₄)Cl₂
mineral
Yellow Jasper (Chalcedony)
Silicon Dioxide with Iron inclusions (SiO2)
sedimentary
Amethyst
Quartz (Silicon Dioxide with iron impurities), SiO2
mineral
Amethyst
SiO2 (Silicon Dioxide with Iron impurities and irradiation)
mineral
Hematite
Hematite (Fe2O3)
mineral
Fluorite on Host Rock
Calcium Fluoride (CaF2)
mineral
New Jade (Serpentine)
Antigorite / Serpentine group (Mg3Si2O5(OH)4)
metamorphic
Likely opal-inlay cross pendant
Opal (hydrated amorphous silica, SiO₂·nH₂O); central red stone is unidentified
gemstone
Rose Quartz in Matrix
Silicon Dioxide (SiO2) with traces of Titanium, Iron, or Manganese
mineral
Emerald (Tumbled Beryl)
Beryllium Aluminum Silicate (Be3Al2Si6O18) with Chromium/Vanadium impurities
mineral
White Agate (Chalcedony)
Chalcedony (SiO2)
mineral
Banded gneiss
Gneiss, chiefly quartz–feldspar–mica (variable composition)
metamorphic
Amethyst (Tumbled)
Amethyst (Silicon Dioxide with Iron impurities), SiO2
mineral
Limonite (Iron Ore)
Limonite (FeO(OH)·nH2O)
Mineral
Gneiss (probable banded metamorphic rock)
Banded gneiss; typically quartz–feldspar–mica assemblage
metamorphic
Limonite Concretion
Limonite (Hydrated iron oxide) FeO(OH)·nH2O
sedimentary
African Turquoise
African Turquoise (a trade name for Jasper, a variety of Chalcedony: SiO2)
sedimentary
Blue Moss Agate
Silicon Dioxide (SiO2) with mineral inclusions
sedimentary
Fluorite
Calcium Fluoride (CaF2)
mineral
Small quartz-rich rock fragment
Likely quartz (SiO₂), possibly a pale granite or feldspar-bearing fragment
mineral
Tumbled green aventurine (likely)
Quartz (SiO₂) with fuchsite or other mica inclusions
mineral
Banded Agate (Dyed)
Silicon Dioxide (SiO2) with impurities
mineral
Carnelian Agate
Silicon Dioxide (SiO2) with high Iron Oxide impurities
mineral
Golden Quartz (Citrine or Iron-stained Quartz)
Silicon Dioxide (SiO2)
mineral
Green Fluorite
Calcium Fluoride (CaF2)
mineral
Pearl necklace with small blue-green gemstone accents
Pearls: nacre, chiefly aragonite (CaCO₃) and conchiolin; accents appear to be turquoise or similar opaque blue-green stone
gemstone
Schist
Mica Schist
metamorphic
Likely tiger’s-eye rough fragment
Tiger’s-eye (quartz, SiO₂, with fibrous crocidolite-derived inclusions)
metamorphic
Amethyst
SiO2 (Silicon Dioxide with Iron impurities)
mineral
Limonite/Goethite Iron Concretion
Hydrated iron oxide-hydroxide mixture (FeO(OH)·nH2O)
mineral
Snowflake Obsidian
Vitreous Silica with Spherulite inclusions (Amorphous SiO2)
igneous
Common Opal (Potch)
Opal (Hydrated silica, SiO2·nH2O)
mineral