Densities of Typical Rock Types and Minerals Rock Type Range (g/cm3) Average (g/cm3) Sediments(wet) Overburden 1.92 Soil 1.2 – 2.4 1.92 Clay 1.63 – 2.6 2.21 Gravel 1.70 – 2.40 2.0 Sand 1.70 – 2.30 2.0 Sandstone 1.61 – 2.76 2.35 Shale 1.77 – 3.20 2.40 Limestone 1.93 – 2.90 2.55 Dolomite 2.28 – 2.90 2.70 Sedimentary rocks (av.)


Obsidian is a natural glass formed by the meeting of lava from an erupting volcano with cold air or water, imbuing obsidian with all four elements: earth, fire, water, and air.. Obsidian is an ancient rock that was discovered in Ethiopia by a Roman explorer named Obsidius.

We know three main classes of rocks, sedimentary, igneous, and metamorphic. Physical properties of rocks play an important role in determining its applications in various fields. According to this it's about 2.7 g/cm^3. The difference is pore space or porosity. Obsidian consists mainly of silicon dioxide (SiO2), usually 70 percent or more. Additionally, obsidian has a lower density and refractive index than quartz. The density of obsidian is 2.55 g/cubic cm. 3 Answers. Luster & Transparency of Obsidian In Obsidian, only 1% of water exists. Ericson et al./Chemical and physical properties of obsidian OBSIDIAN ~PYREX I I I I I I I 200 400 600 800 1000 TEMPERATURE Fig. The density is 2,57 g/cm3.

Indeed, Obsidian is not a true mineral because it … Also, obsidian is singly refractive whereas quartz is doubly refractive. The chemical compositions of red and black obsidian samples from the site are given in Table 1. Obsidian has a glassy lustre and is … Some obsidian has a lot of gas bubbles in it (from gas given out when the volcano erupted) and the presence of these bubbles will give a rock sample a lower density than you would normally expect. Answer Save. In Limestone article, we learned how sedimentation occurs, and the formation of sedimentar.. Would depend how many gas bubbles are trapped within the cooling lava but should be thereabouts 2.4g/cm. Obsidian, igneous rock occurring as a natural glass formed by the rapid cooling of viscous lava from volcanoes. Its accurate density is 2.6 of water at a temperature of 25 Celsius it is equal to 77 degree Fahrenheit. The rock is locally columnar, and at the lower part is traversed by bands or layers of small grey spherulites, but cavities or lithophysae are … What is the density of the obsidian? Rocks are rated on the on the Moh's Hardness Scale which rates the rocks on the scale from 1 to 10. Obsidian Cliff in Yellowstone National Park (Wyoming, USA) is considered a typical occurrence. The cliff forms a giant flow 120–160 m thick. Perhaps in comparison to some other types of glassy volcanic rocks such as scoria, pumice, or tuff, obsidian is dense. 10 years ago. However, there are interesting facts about Oxygen that most don't know about.
0 0 0. 2. Glass transition temperature Softening temperature a) Thermal expansion coefficient (-1) Density (g/cm3) Color Obsidian 690 780 61.6 x 10-7 2.394 black Pyrex 520 600 33 10-7 2.23 clear a) Softening temperature under load. Lv 7. Oxygen Data Oxygen Density g/cm³ 0.001429 g/cm³ kg/m³ 1.429 kg/m³ State at 20 °C Gas Uses Used in steel making, welding, and supporting life.

Chemically, Obsidian closely resembles granite and rhyolite but the processes which lead to the formation of Obsidian are different to those which shape granite.

However, quartz is a harder material than obsidian, at 7 on the Mohs scale, whereas obsidian has a hardness of 5 to 5.5. Favorite Answer.

Its relative density is approximately 2.6.

Spadge. It means it is heavier than water and dense medium as a mass. Login to reply the answers Post; fizixx .

The physical properties of Obsidian depend on its formation. Rocks with hardness 1-3 are soft rocks from 3-6 are medium hardness rocks and 6-10 are hard rocks. Relevance. Obsidian has some similarities to quartz, due to its silicon dioxide content. Obsidian is just volcanic glass and thus has a density of normal igneous rock, a midrange or average density for rocks, usually somewhere about 2.7 grams per cubic centimeter. I need to find the density of obsidian (m/v=density) THANKS Best answer=losta points. Obsidian is extremely rich in silica (about 65 to 80 percent), is low in water, and has a chemical composition similar to rhyolite.

As the others mention, obsidian is not unusual in term of its density. The composition is rhyolitic. Density: 2.6 Luster: Vitreous Cleavage: conchoidal Pure Obsidian is composed of approximately 70% of Si0 2 (Silicon dioxide also known as silica from latin silex meaning flint stone) in water. Its composition is very similar to that of graniteand rhyolite.


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