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Quartz

Posted by Donald B Peck  
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Donald B Peck February 14, 2018 04:43PM
Today I had occasion to look at the Mindat Quartz page. WOW!!! I nave no idea how long it has been as it is now or who is the author; but to whomever put it together, It is a fantastic piece of work, fabulously well done. Thank you!

Don
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Ralph Bottrill February 14, 2018 08:33PM
It is really wonderful, mostly done by Amir Akhavan, who has set a standard few of us could match!
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Scott Rider February 14, 2018 11:27PM
He is also the one responsible for the Quartz Page, a must see if you want to know anything quartz related... Its helped me quite a bit understanding this important mineral.

http://www.quartzpage.de/index.html
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Keith Compton February 15, 2018 04:35AM
Yes, Amir (one of our managers) has done a fantastic job with this page.
Amir explains so much about Quartz - easily understood and well illustrated, as is his website.
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Timothy Greenland February 15, 2018 09:02AM
Very impressive and instructive. I learnt much from a rapid read, and surely will learn more with closer attention as it is easily understandable - even for concepts that I was unclear about before.

Thank you Amir

Sincerely

Tim
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Ed Clopton February 16, 2018 02:57AM
Yeah, what they said! The quartz page is excellent.

The wealth of general information about the species on the quartz page points up a weakness in other Mindat species pages. For all the numerical data and individual specimen info that Mindat so expertly makes available, most species pages include relatively little general text info to give the non-academic user a qualitative feel for the mineral the page represents.

For example, I especially like John Sinkankas's observation that datolite tends to occur in "glassy, faintly greenish, wedge-shaped crystals with odd-shaped faces seemingly placed at random" (Mineralogy for Amateurs, p. 547). Not rigorously quantitative, but in a few words it sure captures the character of datolite crystals! More info like that on species pages (vs. in individual photo captions that most users may never see) would help the more casual user like me who can't look at a table of unit cell parameters and Miller indices and say, "Wow, that would produce crystals with odd-shaped faces seemingly placed at random!"

We can't expect the volume of info presented on the quartz page for every last "whateverite" in the database, but a little more authoritative, qualitative commentary than most species pages presently include would be welcome. That would also be a good way to include curatorial information such as light sensitivity and thermal stability.
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Ralph Bottrill February 16, 2018 12:39PM
Re datolite, yes it would be nice, and I added this snippet. This sort of information tends be be added sporadically and thanklessly, too few of us have the time, references or enthusiasm to do it well. But if anyone is keen to add more info like this to any page we will do our best to assist!
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Alfred L. Ostrander February 16, 2018 02:45PM
Amir has done an excellent job. My sincere compliments!

I do have a comment related more to what might be considered editorial consistency. Amir uses the modified Miller indices known correctly as the Miller-Bravais indices for trigonal/hexagonal mineral forms. Lower in the quartz page the crystallographic models use just the Miller indices. Many of us know what the difference is and how to move back and forth between the two. Many do not. Somewhere, there should be a note helping those who are not aware what is happening to help avoid confusion. It is my opinion that novices don't need anything added to the potential confusion of learning crystallography.

I have also noted that in many of the crystallographic projections for many minerals, only one or two forms are indexed and named while the model also shows other forms. If the form is present, I am of the opinion it should be named and properly indexed. More of a matter of incomplete work, perhaps.

And to be clear, Amir is not responsible for this inconsistency. Personally, I prefer the Miller-Bravais indices and am glad Amir used them. Still, it is important to be aware of the two types.
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Rolf Luetcke February 19, 2018 01:02AM
Amir,
Had to add my comments too. Very, very nice and a great help with information on quartz. Loved what you helped with on the mindat quartz page.
I know I will use the page more with this wealth of information now.
Best to you
Rolf
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Paul De Bondt February 20, 2018 02:09PM
Indeed great work.

We should have such a page on all the minerals with multiple form like calcite, fluorite, pyrite and many more.
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John Montgomery February 20, 2018 05:43PM
FANTASTIC info on Quartz. Thank you Amir. I especially liked the detailed info on Sceptres. How did I miss this page, I'm glad I saw this thread!

BTW... how does one access this page from the Mindat Home Page... ???



Edited 1 time(s). Last edit at 02/20/2018 05:46PM by John Montgomery.
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Donald B Peck February 21, 2018 03:39PM
Go to the bottom of the page, type Quartz in the Hineral Box, and click Search
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John Montgomery February 22, 2018 01:41AM
Thanks Donald, but although this gives a lot of info, I can' seem to find here Amir's page as given above by Scott, which has much greater detail.

John



Edited 2 time(s). Last edit at 02/22/2018 01:48AM by John Montgomery.
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Keith Compton February 22, 2018 02:51AM
John

The link certainly works. Just go to Scott's post and click on the link.
The whole of that site is by Emir.
Just a matter of working your way through it.

Cheers
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John Montgomery February 22, 2018 12:02PM
Yea Keith, thx, I opened the link from Scott alright and it is thorough to say the least. My issue is where on Mindat did Scott get that link. And are there other links to other minerals articles like the quartz done by Amir.

ps I sent Scott a PM so hopefully he will tell me how he found that link



Edited 1 time(s). Last edit at 02/22/2018 12:06PM by John Montgomery.
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