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Hands open, palm holding obsidian volcanic rock at Yellowstone National Park
Agate, agate geode is a non-uniformly used term from geology and mineralogy
American Indian Arrowhead/Spear Point Artifact in Palm of Hand
A black obsidian stone, exposed.
smoky quartz crystal mineral sample used for jewelry or manufacturing
Galena a mineral specimen of natural lead ore collected in the UK
adder stone from the Baltic Sea coast in Waabs, Germany 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.
A shard of a raw, translucent black obsidian crystal. Isolated on white background.
Crystal raw ore
private collection of native american arrow heads with identifiable rudimentary tool marks
Quartz in Ammonit
set of various polished black stones with names cutout on white background
Emerald crystal background.
macro shooting of natural rock specimen - black Spinel crystal on black diopside gemstone isolated on white background
Campo del Cielo meteorite specimen, named for the location of its recovery in Argentina.
Macro of mineral stone Anglesite in Galena on white background close up
crystaline Barite or Barytes mineral sample- clear or translucent dense mineral collected from the UK
natural mineral on a green background with crystal quartz crystals is a  beautiful background and an abstract, macro
chinese medicine Aloe vera resin, dried juice
agate from Idar-Oberstein, Germany
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moss agate crystal mineral sample used as a healing stone
Mineral Fusinus sp. Pliozän
Honey calcite in crystal and needle form. Honey Calcite also known as Golden or Amber Calcite is a calcium carbonate mineral that occurs in masses and rhombohedral forms
Complex metamorphic rock
Two old Indian arrowheads and black background
Aloe vera resin, dried juice
Silex Lanceate bifaces. Stone tool from Lower Paleolithic Era. Isolated
globe buildings spinnings, sphere
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