Obsidian older than a few million years is rare because the glassy rock is rapidly destroyed or altered by weathering heat or other processes.
Is obsidian harder than granite.
Obsidian is a naturally occurring volcanic glass formed as an extrusive igneous rock.
Obsidian is produced when felsic 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 where the chemical composition high silica content causes a high viscosity which upon rapid cooling results in.
Mohs scale of mineral hardness is named after friedrich mohs a mineralogist mohs scale is ordered by hardness determined by which minerals can scratch other minerals.
Granite the most common rock on the continental crust is composed of visible crystals.
It can scratch talc but not calcite which is even harder.
Properties of rock is another aspect for obsidian vs andesite.
Obsidian is extremely rich in silica about 65 to 80 percent is low in water and has a chemical composition similar to rhyolite.
Created in 1812 by german geologist and mineralogist friedrich mohs it is one of several definitions of hardness in materials science some of which are more quantitative.
If the results are confirmed with physical experiments both materials would be far harder than any substance ever measured.
Beyond that their similarities end.
Granite vs obsidian characteristics.
It is confined to areas of geologically recent volcanic activity.
Obsidian is not a genuine mineral or rock it is a natural glass that contains microscopic mineral crystals.
It can be scratched by all other materials.
Despite the fact that they ve been surpassed by.
Obsidian has a glassy lustre and is slightly harder than window glass.
The mohs scale of mineral hardness m oʊ z is a qualitative ordinal scale characterizing scratch resistance of various minerals through the ability of harder material to scratch softer material.
Granite vs obsidian characteristics assist us to distinguish and recognize rocks.
Obsidian igneous rock occurring as a natural glass formed by the rapid cooling of viscous lava from volcanoes.
Characteristics of rocks include texture appearance color fracture streak hardness etc.
Rocks are made up of one or more minerals.
Obsidian and granite are igneous rocks so called because they were formed from the molten magma of volcanoes.
Though some rocks look identical they have certain characteristics which distinguish them from others.
Lonsdaleite is sometimes formed when meteorites containing graphite.
Obsidian is available in black blue brown green orange red tan yellow colors whereas andesite is available in bluish grey grey pink yellow colors.
Appearance of obsidian is shiny and that of andesite is dull and soft.
