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A general guide for using the Forum with some rules and tips
One more for identification
  
  Index -> FOR BEGINNERS: What is it? Where is it from?
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Greg1959




Joined: 22 Jan 2017
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PostPosted: Jan 22, 2017 21:47    Post subject: One more for identification  

Please help with this one. Could it be Rhodonite ?


IMG_0947.JPG
 Mineral: not sure
 Description:
unknown
3cm x 2.5cm
 Viewed:  590 Time(s)

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Pete Richards
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PostPosted: Jan 22, 2017 22:32    Post subject: Re: One more for identification  

This one is not nearly so easy. It is probably not rhodonite. We will need more information to help you with this, if in fact we can. Where is it from? What minerals/rocks was it found with? How hard is it? Etc.

Please read: A general guide for using the Forum with some rules and tips especially point 7:

7.-) If you need help in identifying a mineral then please follow the recommendations given in the ‘Style Guide’ of the section ‘What is this?’ that you can read by following this link

This will help you learn how to approach answering your own questions about things you have, and put you on the path to being able to do your own identifications.

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Collecting and studying crystals with intersting habits, twinning, and epitaxy
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Pete Modreski
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PostPosted: Jan 23, 2017 15:34    Post subject: Re: One more for identification  

Greg, I'll just add a few words to Pete Richards' good suggestions to you. One thing you'll learn about minerals, is that some (especially the very common ones) can be very distinctive and easy to recognize and identify, "at first sight"--like your quartz crystals with iron oxide inclusions. But others, will be much more difficult. Which I'm sure you understand--there are only a few different easily observable physical characteristics--crystal shape, color, hardness, and the other properties described in our "What is this?" section, but there are hundreds--actually thousands, of course, but maybe only hundreds that one is likely to encounter--of different minerals.

So, the more one learns, and studies and observes and becomes more familiar with, the different minerals, the likely you'll be able to identify more minerals with any degree of certainty. And of course, there will always be many that you'll find you can never be "certain" about, without special knowledge (such as the known minerals that are common at a particular mine or locality that has been well studied), or without special scientific tests that "only an expert, with technical equipment" can perform.

Most of the time, when we are making some "fairly simple" test on a mineral, like those described in our "What is this?" web pages, we already have a few likely ideas in mind as to what the mineral might be, and the tests we are doing, are mainly to help distinguish between several logically possible minerals--thus, we may look carefully at the crystal shape or cleavage directions, or try to measure the hardness as accurately as we can (which is not always easy to do), or try to measure the approximate specific gravity, or see if the mineral fizzes in acid.

So with all that in mind, just a couple of suggestions. Common (or perhaps I should say, "not terribly rare" minerals with the color and general appearance of your pink specimen, COULD be perhaps, lepidolite (a type of pink or violet mica), which often may occur, intergrown in or on quartz; or, corundum (ruby or sapphire). Now, these are (or ideally should be) very easy to tell apart; lepidolite, being a type of mica, is quite soft, and is flaky, whereas corundum is very hard. But this is where "details that one learns by experience" come in too; I mentioned about intergrowths; if lepidolite were intergrown with quartz, it might appear to be quite hard, when it is really not (this is where a hand lens or microscope becomes useful); and some corundum can be altered, especially on its surface, to mica or other minerals, hence, its surface may seem to be soft, whereas the pure mineral (in the interior, or before it was altered) is very hard.

Thus, there are always lots of questions and possibilities. But I would keep those two "guess" of mine in mind--which "in theory" should be very easy to distinguish between.
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