What stone/rock is this?

Question

I have this rock that has a mixture of what looks to consist of white quartz, pyrite and shiny, blue/purple stone. Does anyone have a guess to what it could be? Thanks.

Answer 1

I'd like to help you, but listing minerals alone is practically useless for IDing a rock (although certain assemblages are specific to different types of rock). Frankly unless you have been properly instructed in such a manor as to be able to identify minerals in hand sample and the terminology necessary to give an accurate description of the rock it is doubtful at best that you will give me the information necessary to accurately id your rock via text alone. i.e. A sandstone and a granite can have the same composition mineralwise, but they are completely different rocks and you should really just take a good high resolution picture of it along with something for scale (rulers are nice and so is good lighting) and link it to your question, try sites like photobucket if you need somewhere to host your images.



Anyway dude I look forward to helping you out.



Dude if there are grains of pyrite in that thing large enough too see in hand sample I doubt its a granite; that is pretty rare and I'm having trouble placing blue stone; honestly when your talking about pyrite and blue minerals it gets me thinking about some of the metamorphic rocks I've worked with.



Aside from the photo we could start with some basics until you can get one up:



What is the average size of the grains; are there two or more?



What is the size of the pyrite grains?



The blue stone, is it made of fine grains or coarse ones? fine being too small to see in hand sample and coarse being around 2mm or more?



If the grains are large enough to see do they have any distinctive features ie cleavage or shape of well formed grains?



I'm sure you've seen a sandstone before and I doubt thats what you have, but just to be sure is it made up of small sand grains similar to what you've seen?



When you look at the rock does there appear to be layers or a general orientation to elongated minerals as if they were squished?



Are the crystals that make it up interlocking ie. do the grains fit together well without any material in between them?

Answer 2

hi,

it does sound like its prob granite, but yea a pic would be useful, or maybe if you know where its come from at least? dont worry too much about terminology, its best to say what you know and can see rather than take a guess at something wrong, some geologists and students dont get very far in the working world with attitudes that are a bit uppety, because theyre not always going to deal with people who are trained and ive had to work off much worse descriptions.

Answer 3

It's probably granite. Any rock that looks like a "mixture" and contains quartz is usually igneous.

Answer 4

Yeah it is so genuine,and in case you place on come coke bottle glasses and draw a ligtning bolt on your brow with a sharpie you would be Harry potter!beware for voldemort,basically you will stay and in case you p.c.. up the resurection stone you would be the chosen one.....and gay!!!THE HORROR,THE HORROR!!