A general guide for using the Forum with some rules and tips
The information provided within this Forum about localities is only given to allow reference to them. Any visit to any of the localities requires you to obtain full permission and relevant information prior to your visit. FMF is strictly against any illicit activities related to collecting minerals.
|
Search found 110 matches |
Author | Message |
---|---|
![]() |
|
marco campos-venuti Replies: 4 Views: 814 |
![]() |
I realized there is an intruder in your pile of rocks. It is a brecciated marl from the Elba Flysch (Cretaceous). The white stripes are of calcite. | |
![]() |
|
marco campos-venuti Replies: 4 Views: 814 |
![]() |
The pebbles are from Capo Bianco beach, north of the Island, near Portoferraio and are constituted by the Capo bianco aplite dike dated 8.4 My, before the main granodiorite pluton of Monte Capanne dat ... | |
![]() |
|
marco campos-venuti Replies: 7 Views: 2099 |
![]() |
The pocket contained several hundred crystals, all with their respective tourmaline in the center and with the same orientation. I had the opportunity to measure some of them and they all gave values ... | |
![]() |
|
marco campos-venuti Replies: 19 Views: 5525 |
![]() |
I have an untwinned single crystal of titanite from that area. I had it as from Mohmand Agency, Pakistan, not really near, but you know stones in these mountains walk with nomad peoples. It has many s ... | |
![]() |
|
marco campos-venuti Replies: 7 Views: 2099 |
![]() |
In a paper published years ago, I suggested the possibility of quartz epitaxy after tourmaline at an angle of 23.5°. I took these data from a group of quartz crystals probably found in Morro Redondo, ... | |
![]() |
|
marco campos-venuti Replies: 9 Views: 3915 |
![]() |
There are many minerals making nodules with the same fabric. Barite also is a good guess, you can check density. | |
![]() |
|
marco campos-venuti Replies: 10 Views: 8152 |
![]() |
GJX is not planning on having an April show as they "feel things won’t be much different than they are now". | |
![]() |
|
marco campos-venuti Replies: 1 Views: 2556 |
![]() |
Scorias are often filled by silica because cavities drain water. It is difficult to find empty cavities in old scorias from the geological record. More often they are filled by something, zeolites, ca ... | |
![]() |
|
marco campos-venuti Replies: 16 Views: 19401 |
![]() |
I bought this in 2006, supposedly from Brazil. It looks so similar!
Here the yellow appears to be inside. The vermicular growth reminds me of chlorite family minerals. The yellow is brighter in real ... |
|
![]() |
|
marco campos-venuti Replies: 11 Views: 17830 |
![]() |
The distinction from natural citrine and heat treated amethyst is possible with expensive test in a high tech laboratory. Because citrine is a cheap stone, dealers assume all citrine in the market are ... | |
![]() |
|
marco campos-venuti Replies: 2 Views: 5221 |
![]() |
I had this green tourmaline crystal on a recent trip to Brazil. It comes from Barra de Salinas pegmatite. It seems to me a quite unusual termination. Most of crystals from pegmatites have a lower symm ... | |
![]() |
|
marco campos-venuti Replies: 11 Views: 12288 |
![]() |
Of course natural is better as for hair, nose, breast, etc. But in some cases you want to save a specimen. Because of sentiment, because it is very valuable or because it is an educational specimen. I ... | |
![]() |
|
marco campos-venuti Replies: 9 Views: 18619 |
![]() |
Bad News Alan, no agates in Sicily!!!
Despite the tradition wants that the name agate comes from the old name of the Drillo River, a small creek passing near Etna Volcano, there was probably a big hi ... |
|
![]() |
|
marco campos-venuti Replies: 63 Views: 92635 |
![]() |
Hi Roger,
I consider we are at the same side of the theories, as anti-official. But something in your discussion sounds strange to me. A gel is a solid and for that reason can't have viscosity that ... |
|
![]() |
|
marco campos-venuti Replies: 3 Views: 7171 |
![]() |
Check mindat:
https://www.mindat.org/photo-519101.html Wutong Mine (Wudong Mine), Liubao, Cangwu Co., Wuzhou Prefecture, Guangxi Zhuang Autonomous Region, China |
|
![]() |
|
marco campos-venuti Replies: 108 Views: 116294 |
![]() |
I have one sample of the blue inclusion. I'm not sure it is natural or synthetic quartz. No info about any deposit. | |
![]() |
|
marco campos-venuti Replies: 22 Views: 27662 |
![]() |
It is from Rome!
(We are joking, come back to the topic please) |
|
![]() |
|
marco campos-venuti Replies: 22 Views: 27662 |
![]() |
And here is what we call Quartz with iron oxides, because we don't know what it really is. Also from Minas Gerais | |
![]() |
|
marco campos-venuti Replies: 22 Views: 27662 |
![]() |
And here few examples of what I consider Goethite in Quartz. I'm not sure, just is what I use to call it. Mostly yellow and strictly fibrous, more abundant in Amethyst. All samples from Brazil.
The l ... |
|
![]() |
|
marco campos-venuti Replies: 22 Views: 27662 |
![]() |
Few examples of what I suppose is Hematite in Quartz. Mostly red, main characteristic is a flat crystal, more or less elongated.
All sample are from Brazil, difficult to say the exact place. How woul ... |
|
All times are GMT - 5 Hours |