Amethyst
Amethyst (Silicon Dioxide - SiO2)
mineral
Category
Not A Geological Specimen
Browse not a geological specimen specimens identified by the Rock Identifier community.
Chrysocolla
Hydrated copper phyllosilicate (Cu,Al)2H2Si2O5(OH)4 nH2O
mineral
Blue Lace Agate
Silicon Dioxide (SiO₂), a variety of Chalcedony
mineral
Biotite on Matrix
Biotite (K(Mg,Fe)3AlSi3O10(F,OH)2)
mineral
Dendritic Quartz Pebble
Silicon Dioxide (SiO2) with Manganese/Iron oxide inclusions
mineral
Blue Lace Agate
Silicon Dioxide (SiO2)
mineral
Tektite (Indochinite)
Tektite (impactite), primarily high-silica glass (SiO2)
igneous
Amethyst Quartz
Amethyst (SiO2 with Iron impurities)
mineral
Garden Quartz (Lodalite)
Silicon Dioxide (SiO2) with mineral inclusions
mineral
Lapis Lazuli
Lapis Lazuli (Primary mineral: Lazurite (Na,Ca)8(AlSiO4)6(S,Cl,SO4,OH)2)
metamorphic
Banded Agate (specifically Botswana Agate or Water-line Agate)
Chalcedony (cryptocrystalline variety of Quartz), SiO2
mineral
Green Aventurine
Silicon Dioxide (Quartz) with inclusions of Fuchsite (K(Al,Cr)2AlSi3O10(OH)2)
metamorphic
Moonstone (Orthoclase Feldspar)
(K,Na)AlSi3O8
mineral
Jasper
Silicon dioxide (SiO2)
sedimentary
Amethyst
Silicon Dioxide with Iron impurities (SiO2)
mineral
Epidote (likely Unakite component or Epidosite)
Epidote (Ca2(Al2Fe)(SiO4)(Si2O7)O(OH))
metamorphic
Obsidian
Volcanic Glass (70-75% SiO2)
igneous
Pink Opal
Hydrated silicon dioxide (SiO2·nH2O) with inclusions
mineral
Celestine (or Celestite) on Matrix
Celestine (SrSO4)
mineral
Amethyst
Amethyst (Silicon Dioxide, SiO2)
mineral
Crazy Lace Agate
Silicon Dioxide (SiO2) with impurities
mineral
Fuchsite in Quartz
K(Al,Cr)2(AlSi3O10)(OH)2 + SiO2
metamorphic
Clear Quartz (Rock Crystal)
Silicon Dioxide (SiO2)
mineral
Moonstone
Orthoclase feldspar ((K,Na)AlSi3O8)
mineral
Blue Lace Agate
Silicon Dioxide (SiO₂)
Mineral (Variety of Chalcedony/Quartz)
Amethyst
SiO2 (Silicon Dioxide with Iron impurities)
mineral
Tiger's Eye
Pseudomorph of Quartz after Crocidolite (SiO2)
mineral
Citrine Quartz
SiO2 (Silicon Dioxide with Iron impurities)
mineral
Heliotrope (Bloodstone)
Silicon dioxide (SiO2) with inclusions
mineral
Tiger's Eye
Pseudomorph of Quartz after Crocidolite (SiO2 with iron oxide inclusions)
mineral
Strawberry Quartz (Hematoid Quartz)
Silicon Dioxide with Hematite inclusions (SiO2 + Fe2O3)
mineral
Tanzanite
Blue Zoisite (Ca2Al3(SiO4)3(OH))
mineral
Charoite
K(Ca,Na)2Si4O10(OH,F)·H2O
metamorphic
Peach Moonstone
Potassium Aluminum Silicate (KAlSi3O8); variety of Orthoclase Feldspar
mineral
Red Jasper
Silicon Dioxide (SiO2) with iron oxide inclusions
sedimentary
Tiger's Eye
Pseudomorph of Quartz after Crocidolite (SiO2)
metamorphic
Orbicular Jasper (Ocean Jasper or Poppy Jasper variant)
Silicon Dioxide (SiO2) with various inclusions
sedimentary
Chrysocolla
Hydrated copper silicate (Cu,Al)2H2Si2O5(OH)4·n(H2O)
mineral
Snowflake Obsidian
Volcanic glass with Spherulite inclusions (SiO2)
igneous
Moss Agate
Chalcedony (Silicon Dioxide / SiO2)
mineral
Fuchsite Gneiss (Green Quartzite)
Chromium-rich Muscovite (KAl2(AlSi3O10)(OH)2 with Cr replacements)
metamorphic
Rose Quartz
SiO2 (Silicon Dioxide with trace inclusions of dumortierite)
mineral