Lexi Webster
Obsidian is a naturally occurring volcanic glass that is formed when lava from a volcano cools rapidly with minimal crystal growth. It is found near volcanoes that have undergone rhyolitic eruptions. Obsidian is present in several countries, including Australia. In Australia, obsidian has been found in the Roma district and in Riverlands, South Australia.
| Characteristics | Values |
|---|---|
| Countries where obsidian is found | Argentina, Armenia, Azerbaijan, Australia, Canada, Chile, Georgia, Ecuador, El Salvador, Greece, Guatemala, Hungary, Iceland, Indonesia, Italy, Japan, Kenya, Mexico, New Zealand, Papua New Guinea, Peru, Russia, Scotland, the Canary Islands, Turkey, the United States, Israel |
| Where is obsidian found in Australia | Riverlands, South Australia |
| Obsidian formation | Obsidian is a naturally occurring volcanic glass formed when lava extruded from a volcano cools rapidly with minimal crystal growth |
| Obsidian as a glass | Obsidian is a volcanic glass with a smooth uniform texture that breaks with a conchoidal fracture |
| Obsidian as a meteorite | Obsidian is formed when blobs of molten earth rock are thrown skyward during a meteorite impact and cool quickly to form glass |
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What You'll Learn
Obsidian is found near volcanoes
Obsidian is a naturally occurring volcanic glass that is formed when lava extruded from a volcano cools rapidly, preventing the formation of a crystalline structure. As a result, obsidian has a smooth, uniform texture that breaks with a conchoidal fracture, creating sharp edges. Obsidian is commonly found within the margins of rhyolitic lava flows, which have a high silica content, giving them high viscosity. This high viscosity inhibits the diffusion of atoms through the lava, preventing the formation of mineral crystals.
In Australia, obsidian has been reported in Riverlands, South Australia, and Roma in Queensland. Volcanic activity was once widespread in the Roma district, with evidence of extensive lava flows present in the surrounding Carnarvon Range. Obsidian has also been found in the form of tektites, which are glass-like objects formed when meteorites impact the Earth. These tektites are thought to be 610,000 to 750,000 years old, and approximately 100,000 have been discovered across a wide area of the continent south of 24° degrees latitude.
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It's a naturally occurring volcanic glass
Obsidian is a naturally occurring volcanic glass. It is an igneous rock formed when lava extruded from a volcano cools rapidly with minimal crystal growth. Obsidian is rich in lighter elements such as silicon, oxygen, aluminium, sodium, and potassium. It is commonly found within the margins of rhyolitic lava flows, known as obsidian flows. These flows have a high silica content, which gives them a high viscosity. The high viscosity inhibits the diffusion of atoms through the lava, which inhibits the first step in the formation of mineral crystals. Together with rapid cooling, this results in a natural glass forming from the lava. Obsidian is hard, brittle, and amorphous; it fractures with sharp edges.
Obsidian has been found in Australia, specifically in the Riverlands of South Australia. Obsidian artifacts were first found in Central Europe and date back to the Middle Paleolithic, becoming common by the Upper Paleolithic. Obsidian played a crucial role in transmitting Neolithic knowledge and experiences, with the material being used to produce sharp, chipped tools. Obsidian artifacts have been discovered in many Neolithic cultures across Europe, with sources of obsidian for these cultures including Hungary, Slovakia, and the central Mediterranean islands.
Obsidian can also be found in other locations worldwide, including Argentina, Armenia, Azerbaijan, Canada, Chile, Ecuador, El Salvador, Georgia, Greece, Guatemala, Hungary, Iceland, Indonesia, Italy, Japan, Kenya, Mexico, New Zealand, Papua New Guinea, Peru, Russia, Scotland, Turkey, and the United States. Each volcano, and sometimes each volcanic eruption, produces a distinguishable type of obsidian, allowing archaeologists to trace the origins of artifacts through minor element compositions.
In addition to its practical uses, obsidian is also believed to possess metaphysical properties. It is considered a stone of transformation, enlightenment, and protection, shielding against negative energies and supporting individuals in facing their internal and external demons. Obsidian is also thought to enhance eye, nerve, and digestive function, provide detoxification, and assist with hormonal imbalances.
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Obsidian was found in Riverlands, South Australia
Obsidian, a naturally occurring volcanic glass, is found near volcanoes that have undergone rhyolitic eruptions. It is formed when lava extruded from a volcano cools rapidly with minimal crystal growth. It is commonly found within the margins of rhyolitic lava flows known as obsidian flows. These flows have a high content of silica, giving them a high viscosity, which inhibits the diffusion of atoms through the lava. This, along with rapid cooling, results in a natural glass forming from the lava. Obsidian is hard, brittle, and amorphous, and therefore fractures with sharp edges.
In Australia, obsidian has been found in a very small area on Mt Warning in New South Wales, near the Queensland border. However, one source suggests that obsidian was found in Riverlands, South Australia. The rock was described as translucent when light shines through it, especially on the edges, with sharp and smooth edges. While the user who posted about the rock on Reddit was advised by a PhD friend that it was obsidian, other users disputed this, suggesting that it could be a Tektite or slag.
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Volcanic activity was once widespread in Roma, Australia
The volcanic history of the region can be traced back hundreds of thousands of years, with evidence suggesting that the Colli Albani volcano has experienced several distinct eruptive phases. Scientists have identified at least 11 eruptions over the last 600,000 years, indicating that the volcano is not extinct but rather dormant. The earliest eruptive phase contributed to the formation of the Bracciano caldera and included the Tufo di Bracciano major explosive eruption. This was followed by activity from peripheral scoria cones and phreatomagmatic centers located northwest of the caldera.
One of the most significant indicators of volcanic activity in the region is the detection of ongoing inflation, with the hills swelling by approximately 50 meters over the last 200,000 years. This suggests that magma is slowly seeping towards the surface, causing ground deformation and release of carbon dioxide. Additionally, the absence of new magma entering the system does not necessarily indicate a lack of volcanic activity, as old magma can continue to heat the ground, leading to carbon dioxide release, seismic swarms, and ground deformation.
The debate surrounding the volcanic activity at Colli Albani highlights the importance of comprehensive analysis and cross-checking of evidence. While some scientists argue that the volcano is entering a new eruptive phase, others, like Guido Giordano, a geologist at Roma Tre University, suggest that the observed signs could be attributed to the natural behaviour of quiescent volcanoes. Further research and monitoring are necessary to better understand the volcanic activity in the region and assess any potential risks associated with it.
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Obsidian can be eaten
Obsidian is a naturally occurring volcanic glass formed when lava extruded from a volcano cools rapidly with minimal crystal growth. It is found near volcanoes, particularly in the margins of rhyolitic lava flows known as obsidian flows. In Australia, obsidian has been found in Riverlands, South Australia.
Obsidian is commonly known for its historical use in manufacturing cutting and piercing tools due to its ability to form sharp edges when fractured. However, obsidian is not typically consumed or considered edible.
That being said, there is a mention of "umbral obsidian" in a video game context, where it is described as a consumable item that can be eaten to regain a small amount of ether. This is not related to the geological obsidian discussed previously and is purely a video game mechanic.
In conclusion, while obsidian has been utilised by various ancient cultures for its practical properties, it is not traditionally consumed as food and is not considered edible. The reference to consuming umbral obsidian is specific to a video game and does not reflect real-world applications of obsidian.
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Frequently asked questions
Obsidian is found near volcanoes and can be found in Australia. Obsidian has been found in the Roma district, in the form of a rock made of black glass. Volcanic activity was once widespread in what is now Roma and its surrounds. It has also been found in Riverlands, South Australia.
Obsidian is a naturally occurring volcanic glass formed when lava extruded from a volcano cools rapidly with minimal crystal growth. It is an igneous rock.
No, you cannot eat obsidian. Obsidian is a type of rock.
