Amethyst Geode/Cluster
Quartz (SiO2) - variety Amethyst
Mineral
Category
Sedimentary Or Igneous (Host Environment)
Browse sedimentary or igneous (host environment) specimens identified by the Rock Identifier community.
Orange Calcite (Mexican Onyx)
Calcium Carbonate (CaCO3)
mineral
Milky Quartz
Silicon Dioxide (SiO2)
mineral
Epidote
Epidote Group (Ca2(Al2,Fe3+)(SiO4)(Si2O7)O(OH))
metamorphic
Quartzite pebble
Quartzite (primarily SiO2)
metamorphic
Sandstone
Clastic Sedimentary Rock (composed mostly of SiO2)
sedimentary
Glauconite
(K,Na)(Fe3+,Al,Mg)2(Si,Al)4O10(OH)2
mineral
Smoky Quartz
Silicon Dioxide (SiO2)
mineral
Shale
Lutaceous sedimentary rock
sedimentary
Sandstone
Clastic sedimentary rock (primarily SiO2)
sedimentary
Green Fluorite (Beaded)
Fluorite (Calcium Fluoride, CaF2)
mineral
Milky Quartz
Quartz (Silicon Dioxide, SiO2)
mineral
Agate (or Banded Agate)
Agate (a variety of Chalcedony, which is a cryptocrystalline form of Quartz); Chemical Formula: SiO₂ (Silicon Dioxide)
Mineral, specifically a Cryptocrystalline Quartz variety
Sodalite
Sodalite: Na8(Al6Si6O24)Cl2
mineral
Jasper
Silicon dioxide (SiO2) with iron inclusions
sedimentary
Quartz (Iron-Stained)
Silicon Dioxide (SiO2)
mineral
Howlite
Calcium Borosilicate Hydroxide (Ca2B5SiO9(OH)5)
mineral
Milky Quartz (Water-worn Pebble)
Quartz (Silicon Dioxide, SiO2)
mineral
Quartzite
Metamorphosed Quartz Sandstone
metamorphic
Quartzite
Quartzite (primarily SiO2)
metamorphic
Beach Quartzite (Yellow-stained Quartz)
Quartzite (SiO2 with Iron oxide staining)
metamorphic
Quartzite Pebble
Quartzite (primarily SiO2)
metamorphic
Amethyst Quartz Pebble
Silicon Dioxide (SiO2) with iron impurities
mineral
Quartzite River Rock
Quartzite (SiO2)
metamorphic
Quartzite Pebble
Quartzite (SiO2)
metamorphic
Quartz (Smoky/Milky Pebble)
Silicon Dioxide (SiO2)
mineral
Quartzite River Rock
Quartzite (primarily SiO2)
metamorphic
Quartzite River Stone
Metamorphic Quartzite (primarily SiO2)
metamorphic
Limestone
Sedimentary Calcium Carbonate (CaCO3)
sedimentary
Milky Quartz
Silicon Dioxide (SiO2)
mineral
Milky Quartz
Quartz (Silicon Dioxide, SiO2)
mineral
Jasper
Silicon dioxide (SiO2)
sedimentary
Botryoidal Chalcedony
Silicon Dioxide (SiO2)
mineral
Blue Chalcedony
Cryptocrystalline Quartz (SiO2)
mineral
Jasper
Silicon dioxide, SiO2
Mineral
Sulfur (on Matrix)
Native Sulfur (S8)
mineral
Chert
Silicon dioxide (SiO2)
sedimentary
Quartz
Silicon Dioxide (SiO2)
Mineral
Quartzite River Rock
Metamorphic Quartzite (SiO2)
metamorphic
Goldstone (Brown)
Aventurine glass
mineraloid (man-made)
Quartzite Pebble
Metamorphosed Quartz Sandstone (SiO2)
metamorphic
Quartzite Pebble
Quartzite (primarily SiO2)
metamorphic