Pseudomorphs & Replacements J to M

Hi Rock,

Thank you for the reply.
I uploaded into my gallery, here it is : [www.mindat.org]

Take care and best regards.

Paul.

Paul,
Thanks, I have included it in the article. It is an interesting addition.

Rock Currier
Crystals not pistols.

Hello Rock,

Browsing through this section I noticed there wasn't an example of the muscovite ps. after tourmaline from the Sapo Mine. I think these were collected in 2010. Here is an example. If you wish to use it, I have uploaded it to the database.

Regards,
Michael Shaw

Michael,
Can you give me the image number for the specimen? Ill put it in the article.

Rock Currier
Crystals not pistols.

Hi Rock,
The image # is 414119.
Michael

Thanks Michael, its in the article.

Rock Currier
Crystals not pistols.

A specimen for consideration.

Michael,
Yes, it is worthy of being added to the article. I have added it in the section containing the D pseudomorphs.

Rock Currier
Crystals not pistols.

Hello Rock

You have listed one of your photos (added on 2nd May 2010) showing a 6cm Kaolinite after Orthoclase pdeudomorph from the Keith Harshberger collection in the 'Pseudomorphs and Replacements J to M'.
The caption claims that the specimen is from the Slip China Stone Quarry, St. Dennis, St. Austell District, Cornwall. UK, and the image has the reference ID 302068.
I would opine that it is not possible that the specimen originated from Slip China Stone Quarry, the reason being that the quarry lies in the small Fluorite Granite area totally within the nonmegacrystic Lithium Mica Granite of the St. Austell Granite Mass. To my knowledge no megacrysts have been noted from there. There are two major megacrystic zones in the St. Austell Granite Mass, one a lobe in the far west, and a much larger area spanning most of the centre and eastern parts. The specimen illustrated is from one of those two zones.
As it is not possible to designate a specific china clay pit or quarry as its origin, I suggest that the caption should delete Slip China Stone Quarry, and read 'St. Austell District, Cornwall, UK..
Furthermore, the Slip China Stone Quarry lies within the parish of St. Stephen-in-Brannel and not St. Dennis as stated.

Courtenay V Smale

Courtenay,
Thanks you so much, and I really mean that, for your carefully reasoned and explained reasons for giving the image a better locality. So often someone posts something like. Image X is not correct, it should be Y. Their correction could very well be correct, but the poor expert/manager/moderator often does not have a clue if this is true or not. If everyone suggesting changes would explain exactly why they believed something should be changes it would make our jobs here on mindat so much easier. Based on your detailed response I was able to think. Certainly that's right. So I have changed the locality on the image and in the Best Minerals article. Thanks again.

Rock Currier
Crystals not pistols.