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Hands open, palm holding obsidian volcanic rock at Yellowstone National Park
A black obsidian stone, exposed.
American Indian Arrowhead/Spear Point Artifact in Palm of Hand
Agate, agate geode is a non-uniformly used term from geology and mineralogy
cassiterite (tin ore) from Viloco, Bolivia isolated on white background
Asbestos family mineral band in geological rock sample
specimen of natural raw quartz crystal cutout on white background
rough gemstones on neutral background
smoky quartz crystal mineral sample used for jewelry or manufacturing
Crystal raw ore
private collection of native american arrow heads with identifiable rudimentary tool marks
Slice Of Agate Crystal
Aragonite
barite mineral specimen stone rock geology gem crystal
Quartz in Ammonit
Macro mineral stone Schorl, Black Tourmaline on the feldspar on a white background close-up
Campo del Cielo meteorite specimen, named for the location of its recovery in Argentina.
natural mineral on a green background with crystal quartz crystals is a  beautiful background and an abstract, macro
Galena a mineral specimen of natural lead ore collected in the UK
manganese or manganite mineral sample with quartz and calcite
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cubic grossular from Siberia, Russia isolated on white background
Agate is a microcrystalline variety of quartz, chiefly chalcedony, cryptocrystalline form of silica.  Although agates may be found in various kinds of rock, they are classically associated with volcanic rocks but can be common in certain metamorphic rocks. Most agates occur as nodules in volcanic rocks or ancient lavas where they represent cavities originally produced by the disengagement of volatiles in the molten mass which were then filled, wholly  by siliceous matter deposited in regular layers upon the walls. Cathedral Valley, Capitol Reef National Park, Utah.
set of various amethyst natural mineral stones and gemstones on grey fabric background top view
Rock  crystal from USA
Macro mineral stone Schorl, Black Tourmaline on the feldspar on a white background close-up
Aloe vera resin, dried juice
a piece of obsidian being held in a hand
Fossilised Fish
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