Celestite (Celestine)
Strontium sulfate (SrSO4)
Mineral
Category
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Tektite (Indochinite)
Tektite (natural glass, SiO2 + Al2O3)
mineral
Biotite Schist
Biotite Schist
Metamorphic
Fossil Coral
Fossilized Scleractinia or Tabulata (various genera/species)
Sedimentary
Aventurine
Silicon dioxide with micas (SiO2 + K(Al,Cr)2AlSi3O(OH)2)
metamorphic
Raw Carnelian (Chalcedony)
Silicon Dioxide (SiO2) with Iron Oxide impurities
mineral
Amethyst
Amethyst is a variety of Quartz (SiO₂)
Mineral
Dendritic Agate (or Dendritic Opal)
SiO2 (for Agate), SiO2·nH2O (for Opal)
Mineral
Moss Agate
Moss Agate (a variety of Chalcedony, SiO ₂)
Mineral (specifically a variety of Chalcedony, which is microcrystalline Quartz)
Amethyst (Digital/Conceptual Representation)
Amethyst (Silicon Dioxide with iron impurities, SiO2)
mineral
Fossilized Coral (Petoskey Stone or similar Hexagonaria variant)
Hexagonaria percarinata (Fossilized Coral)
sedimentary
Rose Quartz
Silicon Dioxide (SiO2)
mineral
Septarian Nodule (or Mudstone with Septarian Cracking)
Septarian Concretion (Composition: Calcite, Aragonite, and Limestone/Claystone)
sedimentary
Chert (Flint)
Microcrystalline or Cryptocrystalline Quartz (SiO2)
sedimentary
Blue Aventurine
Silicon Dioxide (SiO2) containing Dumortierite or Crocidolite inclusions
mineral
Jasper
Jasper (Silicon Dioxide, SiO2)
sedimentary
Red Jasper (possibly Petrified Wood)
Silicon Dioxide (SiO2) with Hematite inclusions
sedimentary (secondary formation)
Red Jasper
Silicon Dioxide (SiO2) with iron oxide inclusions
sedimentary
Chert (variant Flint)
Silicon Dioxide (SiO2)
sedimentary
Zebra Jasper
Silicon dioxide (SiO2) with various impurities
Sedimentary
Amber
Succinite (with a generalized formula of C10H16O)
mineral
Lapis Lazuli Globe
Complex mixture of Lazurite ((Na,Ca)8(AlSiO4)6(S,Cl,SO4,OH)2), Calcite, and Pyrite
metamorphic
Obsidian
Volcanic glass (high silica SiO2)
igneous
Rose Quartz
Rose Quartz (SiO2)
mineral
Amethyst
Amethyst (Silicon Dioxide, SiO2 with Iron impurities)
mineral
Prehnite
Prehnite, Ca2Al2Si3O10(OH)2
Mineral
Tiger's Eye
Pseudomorph of Quartz after Crocidolite (SiO2 with Iron inclusions)
metamorphic
Carnelian
Chalcedony (cryptocrystalline quartz), SiO2
Mineral
Puddingstone (Jasper Conglomerate)
Conglomerate (specific type: Jasper Conglomerate or Hertfordshire Puddingstone)
Sedimentary
Lapis Lazuli
Lapis lazuli (Complex silicate mixture including Lazurite, Calcite, and Pyrite)
metamorphic
Amethyst
Quartz (SiO2) with trace iron impurities
Mineral
Conglomerate
Conglomerate (a clastic sedimentary rock)
Sedimentary
Aquamarine
Beryl (Be3Al2Si6O18 with iron traces)
mineral
Amethyst
SiO2 (Silicon Dioxide with iron impurities)
mineral
Obsidian
Obsidian (Amorphous volcanic glass, SiO2 with impurities)
igneous
Biotite Mica
Biotite, K(Mg,Fe)3AlSi3O10(F,OH)2
mineral
Obsidian
Obsidian (Volcanic glass), SiO2 (major component)
igneous
Obsidian
Volcanic glass (primary composition: SiO2)
igneous
Amethyst (variety of Quartz)
SiO2 (Silicon Dioxide) with trace iron impurities
Mineral
Tiger's Eye
Pseudomorph of Quartz after Crocidolite (SiO2 with inclusions of Iron Oxide)
metamorphic
Limonite (Iron Stone/Gossen)
Limonite (FeO(OH)·nH2O)
mineral
Amethyst/Smoky Quartz Cluster
Silicon Dioxide (SiO2)
mineral