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A mineral is classified as an ore as long as what?
A mineral is generally classified as an ore, if its locallized concentration far exceeds its crustal abundance.
Must all rocks form crystals?
All rock does not contain mineral crystals. Obsidian, or volcanic glass, in particular is a rock that has cooled so quickly from lava that mineral crystals were not able to form.
Would gabbro or obsidian make a better arrowhead?
Obsidian
What is dark glassy volcanic rock called?
obsidian
Is obsidian extrusive rock?
No. Obsidian is volcanic glass. Glass is amorphous and thus noncrystalline.
What are the minerals in obsidian?
Obsidian is, itself, a mineral.
What crystal group is obsidian in?
No one knows my namestake like I do (except Crystallography majors) and in reality obsidian is not quite classified as a type of crystal at all, as its composition is too complex to comprise a single mineral, it's usually just considered a mineraloid.
What are 3 examples of mineraloid?
Mineraloids are a mineral like substance that don't exhibit crystallinity. 5 Examples: mercury pearl obsidian anthracite jet
What is the origin Obsidian?
The origin is from medievil english. By the way, obsidian is a black mineral.
Is obsidian an element or compound?
Neither. It is a mineral mixture.
Does obsidian rock contain few or no mineral grains?
That is correct.
What mineral can be easily identified by it's color?
Obsidian because it's the only mineral that is the blackest of well......black! Anyway it's black I mean Obsidian (\_/) (o.o) (___)o
Is obsidian a mineral?
No. Obsidian is not crystalline so is not a mineral. It forms from the extremely rapid cooling of lava which means that crystals do not have time to form. This is described as a vitreous or glassy texture.
How much inches high is obsidian?
Obsidian is not identified, classified, or described by height. It is described by its texture, fracture, hardness, and chemical composition.
Why is coal not classified as a mineral?
Its a organic mineral.
Why is the texture of obsidian is best contain few or no minerals grains?
Obsidian cools so quickly the mineral grains do not have time to form.
Is diamond stronger or obsidian?
Diamond is the hardest natural mineral known.
