Ferruginous Quartzite (also known as Ironstone or Gossan)
Ferruginous Quartzite with Goethite/Hematite staining
metamorphic
Category
Metamorphic Or Sedimentary Depending On Local Grade
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Tiger's Eye
Quartz (chalcedony) with crocidolite inclusions, SiO2
mineral
Ferruginous Quartz
Silicon Dioxide (SiO2) with Iron Oxide inclusions
mineral side of metamorphic/igneous sources
Emerald in Matrix
Beryl (Be3Al2Si6O18) with Chromium impurities
mineral
Serpentinite
Serpentinite
metamorphic
Unakite
Epidotized Granite
metamorphic
White Quartz (Milky Quartz)
Silicon Dioxide (SiO2)
mineral
Dendritic Agate (or Dendritic Opal)
SiO2 (for Agate), SiO2·nH2O (for Opal)
Mineral
Greenshist / Chlorite Schist
Chlorite schist (contains (Mg,Fe)3(Si,Al)4O10(OH)2·(Mg,Fe)3(OH)6)
metamorphic
Druzy Quartz on Chalcedony Matrix
Silicon Dioxide (SiO2)
mineral
Raw Emerald in Matrix
Beryl (Be3Al2Si6O18) with Chromium/Vanadium impurities
mineral
Nephrite Jade
Nephrite (Ca2(Mg, Fe)5Si8O22(OH)2)
metamorphic
Quartzite with Iron Inclusions
Quartzite (primarily SiO2 with Fe2O3 impurities)
metamorphic
Pebble (likely a type of sandstone or quartzite pebble)
Clastic Sediment (specifically, a rudite-sized clast). If the pebble is composed of a specific rock type, its scientific name would be that rock type (e.g., 'Quartzite pebble', 'Granite pebble', 'Chert pebble'). Given its appearance, it is likely a metamorphic quartzite pebble or a hard sandstone pebble.
Sedimentary rock
Anthracite Coal
Anthracite (Carbon)
metamorphic
Nuummite
Nuummite (complex silicate composed of Anthophyllite and Gedrite, (Mg,Fe)7Si8O22(OH)2)
metamorphic
Quartz with Mica (Gneissic or Pegmatitic origin)
Silicon Dioxide (SiO2) with Phyllosilicates (KAl2(AlSi3O10)(F,OH)2)
metamorphic
Greenstone with Epidote or Quartz Vein
Epidiorite or Metabasalt (composed largely of Chlorite, Epidote, and Amphibole)
metamorphic
Slate
Metamorphosed Shale (Fine-grained Foliated Metamorphic Rock)
metamorphic
Greenstone (Greenschist)
Greenschist (composed of Chlorite, Epidote, and Actinolite)
metamorphic
Greenschist
Greenschist (chlorite-epidote schist)
metamorphic
Emerald
Beryl (Be3Al2(SiO3)6) with trace Chromium/Vanadium
mineral
Ruby and Diamond in Gold Setting
Corundum (Al2O3) and Diamond (C)
mineral
Chalcedony / Agate
Silicon Dioxide (SiO2)
mineral
Emerald in Matrix
Beryl (Be3Al2Si6O18) with Chromium/Vanadium impurities
gemstone
Greenstone / Greenschist
Greenschist (composed primarily of Chlorite, Epidote, and Actinolite)
metamorphic
Greenstone
Greenschist / Greenstone (Chlorite-Epidote facies)
metamorphic
Greenstone
Greenschist (metamorphosed mafic igneous rock)
metamorphic
Anthracite Coal
Anthracite (high-rank coal)
metamorphic
Anthracite Coal
Anthracite (Carbon)
metamorphic
Green Tourmaline (Verdelite)
Tourmaline Group; often Elbaite (Na(Li,Al)3Al6(BO3)3Si6O18(OH)4) or Dravite (NaMg3Al6(BO3)3Si6O18(OH)4)
Mineral
Green Aventurine
Quartz (Aventurine variety) - SiO₂ with Fuchsite inclusions
Mineral
Quartz (likely Milky Quartz or Chalcedony)
Quartz (SiO2 - Silicon Dioxide)
Mineral
Black Sapphire
Corundum (Al2O3)
mineral
Limonite Pseudomorph after Pyrite
Limonite (Hydrous iron oxides e.g., FeO(OH)·nH2O) pseudomorphing Pyrite (FeS2)
mineral
Corundum (Sapphire/Ruby in Matrix)
Aluminium oxide (Al2O3)
mineral
Epidote
Epidote (formula: Ca2(Al2,Fe3+)(SiO4)(Si2O7)O(OH))
mineral
Garnet (Almandine/Pyrope series)
Silicate mineral (Almandine: Fe3Al2Si3O12; Pyrope: Mg3Al2Si3O12)
mineral
Agate
Cryptocrystalline quartz (SiO2)
Mineral
Quartzite Pebble
Quartzite (mostly SiO2)
metamorphic
Fuchsite in Quartz (Aventurine Quartz)
K(Al,Cr)2(AlSi3O10)(OH)2 (Fuchsite) + SiO2 (Quartz)
metamorphic
Mica Schist
Mica Schist (predominantly Muscovite or Biotite sheet silicates)
metamorphic