Kaolinite (Chalky Clay)
Kaolinite (Al2Si2O5(OH)4)
sedimentary
Category
Minerals
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Kyanite in Quartz
Kyanite (Al2SiO5) with Quartz (SiO2)
metamorphic
Almandine Garnet in Schist
Almandine, Fe3Al2(SiO4)3
metamorphic
Mixed Mineral Specimens
Mixed Silicates, Oxides, and Phosphates (SiO₂, Ca₅(PO₄)₃(F,Cl,OH), Na₈Al₆Si₆O₂₄Cl₂, etc.)
mineral
Azurite with Malachite
Azurite: Cu3(CO3)2(OH)2 / Malachite: Cu2CO3(OH)2
mineral
River Quartzite Siltstone
Quartz-rich Meta-siltstone (SiO2 dominated)
metamorphic
Diorite
Diorite (Intermediate intrusive igneous rock)
igneous
Granitic Pegmatite with Schorl
Granitic Pegmatite (Schorl: NaFe3Al6(Si6O18)(BO3)3(OH)3OH)
igneous
Moonstone
Adularia or Orthoclase (KAlSi3O8) or Albite (NaAlSi3O8), specifically with lamellar exsolution of albite and orthoclase.
mineral
Prehnite
Ca2Al(AlSi3O10)(OH)2
mineral
Clear Quartz with Limonite
Silicon Dioxide (SiO2) with Hydrated Iron Oxides
mineral
Quartz with Schist/Mica Inclusions
Crystalline Silicon Dioxide (SiO2) with Phyllosilicates
metamorphic
Quartz Vein in Host Rock (often Granite or Schist)
Silicon Dioxide (SiO2) within host matrix
mineral with metamorphic or igneous host
Pegmatite (with Quartz and Feldspar)
Granitic Pegmatite
igneous
Dalmation Stone (Dyed)
Peralkaline rhyolite
igneous
Slate
Slate (Low-grade regional metamorphic rock)
metamorphic
Brachiopod Fossil
Phylum Brachiopoda (likely Order Rhynchonellida or Spiriferida)
fossil
Rough Rose Quartz
Quartz (Silica - SiO2)
mineral
Lepidolite
K(Li,Al)3(Al,Si,Rb)4O10(F,OH)2
mineral
River Pebble (Graywacke/Sandstone)
Lithic Sandstone
sedimentary
Green Aventurine
Silicon Dioxide with Fuchsite (SiO2 + K(Al,Cr)2AlSi3O10(OH)2)
metamorphic
Clear Quartz
Silicon Dioxide (SiO2)
mineral
Rose Quartz
Silicon dioxide (SiO2)
mineral
Blue Quartz
Quartz (Silicon Dioxide) with blue inclusions (SiO2)
mineral
Limonite (Iron Ore)
Limonite (mixture of hydrated iron(III) oxide-hydroxides)
Mineral
Chert (variously known as Flint)
Microcrystalline quartz (SiO2)
sedimentary
Hematite
Hematite (Fe2O3)
mineral
Quartz
Silicon Dioxide (SiO2)
mineral
Lepidolite
Lepidolite (K(Li,Al)3(Al,Si,Rb)4O10(F,OH)2)
mineral
Moqui Marble / Ironstone Concretion
Ironstone Concretion (Goethite/Hematite and Sandstone)
sedimentary
Lepidolite
Lepidolite (K(Li,Al)3(Al,Si)4O10(F,OH)2)
mineral
Red Jasper
Silicon Dioxide (SiO2) with iron inclusions
mineral
Orthoclase Feldspar (Sunstone variety)
KAlSi3O8 (Potassium Aluminum Silicate)
mineral
Fuchsite in Quartz
Muscovite (KAl2(AlSi3O10)(OH)2) containing Chromium + Quartz (SiO2)
metamorphic
Rose Quartz
Rose Quartz (SiO2)
mineral
Garnet (Pyrope or Almandine)
Silicate (X3Y2Si3O12)
mineral
Breciated Chert
Brecciated Chert (Microcrystalline Quartz, SiO2)
sedimentary
Malachite in Host Rock
Malachite - Cu2CO3(OH)2
mineral
Milky Quartz
Silicon Dioxide (SiO2)
mineral
Rhodonite
Manganese silicate: (Mn,Fe,Mg,Ca)SiO3
mineral
Quartz (Milky/Clear variety)
Silicon Dioxide (SiO2)
mineral
Rose Quartz
Quartz (SiO2) with trace amounts of titanium, iron, or manganese
Mineral