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Antigorite

Posted by Rock Currier  
avatar Antigorite
May 18, 2009 06:21AM
©


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This article is a place holder and needs someone to take it in hand and finish the first draft. If you would like to take this article in hand, leave a reply message below or contact Rock Currier via private message by clicking on the PM button next to my name at the top of the article.



Click here to view Best Minerals A and here for Best Minerals A to Z and here for Fast Navigation of completed Best Minerals articles.


Can you help make this a better article? What good localities have we missed? Can you supply pictures of better specimens than those we show here? Can you give us more and better information about the specimens from these localities? Can you supply better geological or historical information on these localities?

Below are some preliminary notes I have made about Antigorite. This entry and thread has been made as a place holder for information that you will hopefully contribute about Antigorite. It should be in no way be thought of as a claim I have staked out to write about this mineral, and in fact is an invitation for someone to step forward and create the article about this mineral. If you are so inclined and have questions about the format that such an article should have, go the The welcome topic at the top of the Best Minerals forum and read what has been posted there. Also take a look at some of the more mature articles that have already been written like Rhodochrosite, Adamite, Millerite etc. You will need also to pick out other images of Antigorite that will go into the article.



Antigorite
Mg3Si2O5(OH)4 Monoclinic, polymorphic with Clinochrysotile, Lizardite, Orthochrysotile & Parachrysotile
2mm green Antigorite balls & Aragonite, Arrestra Quarry, Cogoleto, Genova Province, Liguria, Italy © G. Armellino


Antigorite Display collections?
(Mg,Fe2+)3Si2O5(OH)4
Antigorite is found at many localities but not in crystals. This mineral is in the kaolinite-serpentinite group and this group is for the most part not of much interest to mineral collectors unless they are into lapidary materials, rare species, or clay minerals. Never the less, antigorite sometimes forms interesting pseudomorphs.
Ask Kieth if he knows of some good examples.

Antigorite
China
Liao Ning Province, Ying Kou Prefecture, Shou Yan: The material from this locality is a beautiful translucent apple green color. Some of the material is almost white with a tint of green and the more valuable grades are a more intense and darker green. The material is commonly called jade in China, or if you press them by pointing out that it is too soft to be real jade because you can scratch it with a knife, they will call it new jade. For many years this locality has produced tons of rough stone that have been used by the lapidaries of the region to make a vast array of traditional stone carvings. They can be seen in almost any oriental antique store and museum with oriental stone carvings. The best rough is sold in China for only a few dollars a kg. It compares favorable with the old material called williamsite from the Line Pit on the Pennsylvania/Maryland border in the USA. This material has historically been worked into carvings and other lapidary objects in Henan Province.

Antigorite
Italy
Val di Fassa The most interesting specimen of antigorite I ever saw, assuming it was identified correctly, was this antigorite pseudomorph after monticellite from Val di Fassa. The main pseudomorphed crystal on the specimen shown here is sharp and about 3 cm in diameter. I am not a pseudomorph freak, but would gladly put a specimen like this in my collection. Perhaps there are more good specimens of this type around than I know about. Can anyone out there help me out? Specimens of this probably would not be expensive, probably likely than $500.

Antigorite
United States
Pennsylvania/ Maryland, Texas, Line Pit. The locality is about 1 kilometer northwest of Rock Springs, Maryland. “…the Line Pit or Lows mine, which straddles the Mason-Dixon Line between Pennsylvania and Maryland…is best known for the high grade of chromite ore…and the former abundance of translucent emerald-green antigorite (variety williamsite) which is as beautiful as the finest jade. …An unusual variety of deep emerald-green micro-fibrous antigorite, “williamsite” forms an envelope or casing 30 to 60 cm in thickness around the central massive chromite pipe. It also occurs as border zones along faults. This variety of antigorite is highly prized by mineral collectors and now is uncommon on the remaining dumps.”1 This variety of antigorite is now very uncommon and though pretty, it is no way as beautiful as a good quality imperial jade. The author’s enthusiasm is understandable, however.
1 Mineralogical Record, Vol. 12, 1981, p 149-53.

Antigorite
Arizona, Graham County, Bisbee. “Found near the numerous porphyry dykes and not uncommon in the Sacramento contact zone. Cole Shaft-1400 level, as a white-green flaky material with pyrite. Holbrook shaft-500 level, 555 drift, banded pink and green layers of platy antigorite with calcite, pyrite and hematite…Lowell shaft-1300 level, 13-9 stope, green radiating plates and needles with pyrite and chalcocite…”1
1 Mineralogical Record, Vol. 12, 1981, p 290.



Click here to view Best Minerals A and here for Best Minerals A to Z and here for Fast Navigation of completed Best Minerals articles.

Rock Currier
Crystals not pistols.



Edited 3 time(s). Last edit at 12/27/2012 08:47AM by Rock Currier.
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