Would gabbro or obsidian make a better arrowhead?
Obsidian. It has very fine grain or is amorphous, and it has a conchoid fracture, so it can be worked to a sharp edge and point. Gabbro, on the other hand, has a very coarse grain and it difficult to get and edge or point on at all.
Igneous rocks are formed by the solidification of magma or lava. Examples would be pumice, granite, rhyolite, basalt, gabbro, diorite, and obsidian.
Rocks formed from solidified molten rock are classified as igneous rock. Examples would be basalt, granite, gabbro, pumice, obsidian, and rhyolite.
When you crushed Gabbro you would obtainOlivine, Pyroxene(Augite), and Plagioclase
No. Gabbro is mafic-ultramafic. An example of a felsic rock would be a granite or rhyolite.
where would you find obsidian in the ocean or the mountains or in minecraft XD
Gabbro is an igneous rock, and therefore does not have a parent rock as would a metamorphic rock. Gabbro is an intrusive igneous rock formed from the slow cooling and solidification of mafic magmas deep underground.
Obsidian is a type of rock, so the texture would be very rough.
Any rock that erupted on (lava) or within the Earth or crystallized from molten rock (magma). Such rock would fall into two categories: Intrusive (crystallized within the Earth), granite, gabbro, diorite, pegmatite, peridotite and extrusive (erupted and crystallized on the surface) rhyolite, andesite, obsidian, basalt, tuff and pumice.
Why would basalt and gabbro generally have higher chemical weathering rates than rhyolite and granite?
The ferromagnesian minerals in the gabbro and basalt are subject to oxidation and chemical breakdown.
In the 1800's, many Native Americans would sharpen obsidian into spear tips.
Obsidian would fall into the 5-5.5 range on the Mohs scale, although technically it is not a mineral.
A: Carbon-14 dating could not be used directly from the arrowhead itself. However, the bones associated with the arrowhead could be dated by this method, if they are sufficiently recent for this method. If the arrowhead is properly associated with the bones, you would then know its age.
Anyone can give anything on a server and you would get to keep it, just begging people for it is hard, but the obsidian skull is not hard to make. Only 30 obsidian.
Obsidian has been used as a ornamental and practical items for thousands of years. When it was discovered by humans would be very difficult to determine.
800 grams is about one and three quarters of a pound. This is true for obsidian or for anything else that you are weighing.
black, shiny and inactive.
Examples would include: gabbro, granite, diorite.
There are many. A few would be diorite, granite, gabbro, and basalt.
Basalt or gabbro. Mafic igneous rock.
Strictly speaking obsidian is not a rock as it is not composed of crystals so can't be mineralic! It is technically a volcanic glass. It's Moh's hardness is approximately 5-6 according to the Wikipedia entry for Obsidian although an exact value would depend on the exact composition of the Obsidian in question.
Obsidian is formed as extruded lava with a high silicon content that cools quickly. So the environment would be a volcano.
It's technically possible but rare for phenocrysts to be found in an obsidian. This would require the magma rising to the surface and cooling quickly.
I would say it is a compund.
Obsidian is an extrusive rock and is formed from rapidly cooling magma. Obsidian is also known as volcanic glass and one can find only sub-microscopic crystals in it. This is because it was cooled too fastly for large crystals to form. If the material that obsidian consists of were an intrusive rock and had a lot of time to cool down, one would find that it would be composed of easily visible crystals.
Obsidian forms from cooling lava without crystal growth. Lava has a liquid temperature range of 700 °C to 1,200 °C (1,300 °F to 2,200 °F). I would assume that Obsidian would melt at those respective temperatures. Sorry, if my answer isn't the best. However I couldn't find a definite answer on this one.
Most often it would be obsidian.
You could find obsidian near a volcano.
Rock. Rock types would include Granite, Gabbro, Andesite, Basalt etc.
no, obsidian is a volcanic glass and would shatter under a strike from a steel blade. DO NOT ATTEMPT THIS, AS YOU WILL DIE OR BE INJURED.
is plutonic (meaning it is formed slowly deep within the earth) while basalt is volcanic (meaning it has been transported to or near the surface) same composition, gabbro would be more likely to exhibit crystalline growth while basalt would be more fine grained to aphanitic
No... obsidian is volcanic glass and it is unstable over long periods of geologic time. The rocks in northern GA are too old, any obsidian would have long ago chemcial broken down, and the rocks in southern GA formed during a period of GA history when there were not volcanoes.
The scientific or taxonomic name would be Sagittaria spp.
A 4 sided arrowhead quadrilateral would fit the description.
You can cut obsidian with a rock saw or a diamond tile saw, but in order to maintain the shine, you would have to polish it. Equipment is sold for this purpose.
It is a volcanic glass. Perhaps there would be other names too.
There are no minerals in obsidian. Minerals must have a crystalline structure. Because obsidian cooled so rapidly after eruption, crystals had no time to form, creating a volcanic glass instead. If the lava had been able to form crystals, they would have been mostly silicate in nature, like quartz, feldspars, and micas.
A concave quadrilateral would be a non-convex quadrilateral. * * * * * Also known as delta or arrowhead or chevron.
There are some that would probably be within the 10th of a degree but none are exactly the same.
A few would be obsidian, pumice, and basalt.
Obsidian (volcanic glass) is unstable and it de-vitrifies (crystallizes) with time, it is also only produced from viscous, acidic lavas. You would therefore look for it in recently produced lavas in continental volcanoes. Thus while obsidian is not uncommon, it does not last very long geologically. Where it is found it is found in large amounts.
The scientific or taxonomic name would be Syngonium podophyllum.
Yes it is. The Native Americans would walk great distances to collect it.
The material that would normally form mineral crystals does not have time to form a crystalline structure because of very rapid cooling after volcanically erupting into the air or onto the surface. Obsidian is a volcanic glass.
That, my good sir would be called a "fish-point"
Value? To whom? It's all relative and much would depend on who's buying it.
it really depends on what condition it is and where it was found but the highest money possible would come from a museum or a historian
Chert, flint, or obsidian were the materials normally used.
There is nothing special that would happen im sorry :(