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volcanic bomb from the slopes of Vesuvius volcano. Isolated on white background, close-up.
American Indian Arrowhead/Spear Point Artifact in Palm of Hand
flint from from Vlissingen, Netherlands isolated on white background
An ancient well made of stone material
From above of rough rock placed on shabby surface near hammer on table in stone workshop in sunlight
Isolated porous brown volcanic rock. Lava, pumice or volcanic pumice with unique pores, close-up
natural mineral on a green background with crystal quartz crystals is a  beautiful background and an abstract, macro
shale or claystone rock sample from the UK
Kawah Ijen, Indonesia - August 9, 2011: Miner collects sulphur in the fumes of toxic volcanic gas at the sulphur mines in the crater of the active volcano of Kawah Ijen, East Java, Indonesia.
Mineral Fusinus sp. Pliozän
black flint from the Baltic Sea coast in Waabs, Germany isolated on white background
Calmitacea inside a peace of stone. The fossil was growing in the Carboniferous Period (around 360 to 300 million years ago).
Big natural stone green amber on white background
Stack of Gray Rocks Isolated on White Background
natural stone, Background
Scenery of Bisti Northern Section, Farmington, New Mexico, USA
Kawah Ijen, Indonesia - August 8, 2011: Miner collects sulphur in the fumes of toxic volcanic gas at the sulphur mines in the crater of the active volcano of Kawah Ijen, East Java, Indonesia.
Meteorite floating in mid-air against cloudscape.
snowflake obsidian from Mexico
A rock sample of Obsidian a volcanic glass rock extruded from a volcano
Displayed in a glass box are different types of coal, each showcasing unique textures and colors. The collection includes anthracite, bituminous, sub-bituminous, and lignite.
The eagle shells jade stone with white background
Small rough gold ingot of ancient time.
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 detailed macro shot of a smooth, round black tektite, showcasing its mysterious and enigmatic character. This meteoritic glass, with its otherworldly origins, is a powerful visual for both scientific studies and high-impact marketing campaigns.
The plant fossils in this sample were formed by transformation of plant remains into coal. Presence of \nplant fossils in the mudstone indicates a quiet and generally anaerobic depositional condition, allowing \nhe plants to be preserved without being oxidized.
Axe head from Stone Age, found in a landslide.
Mineral plaster from Hallstatt
Macro mineral stone stilbit over white background
Long abandoned and ruined walls of old mining structures. House Range of western Utah.
Free Images: "bestof:Vulcanic bomb 008.jpg Vulcanic bomb with geology hammer Origin Old Stratovulcan near Kladno in Czech republic 2006-07-23 own assumed Chmee2 Volcanic bombs Files"
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