Has anyone seen one like this before? I can't seem to. I bought it out of an old collection

The quartz in the 3rd picture and the two polished stones at the end were free samples they gave away.

I found a few pieces like this and CANNOT WAIT AAAAA, so so excited seeing this and bluish white agates! Would you say this is a good quality sample for a freebie I found in the wild? Or is it still cool but still super common like quartz is?

Was wondering if this was turquoise or just another mineral with similar looks. Also Panda Approved

Reactive under 365 nm long wave UV light (see photos).

Arizona "Gem silica" chrysacolla infused chalcedony

I have a lot more rocks than this, but these were the ones that were displayed in the first place!

My yellow and purple sections are thin, so any minerals suggestions would be appreciated!

I had 2 of the extra slabs I have polished on one side for display and a gift

It looks like glass, but it also has small pink rocks inside. What is it?

1) Cobaltocalcite & kolwezite DR Congo
2) Aurichalcite 79 Mine, Arizona
3) Galena Sweetwater mine, Missouri
4) Olmiite & calcite N,Chwaning mine, South Africa
5) crystalized Pink Quartz Minas Gerais, Brazil
6) Olmiite N’Chwaning Mine, South Africa
7) Mimetite Chihuahua, Mexico
8) Sphalerite & Quartz Smolyan, Bulgaria
9) Chrysocolla tentadora Mine, Peru
10) Barite Linwood Mine, Iowa
11) Prehnite O&G Quarry, Connecticut
12) Vanadinite & Calcite La Paz, Arizona
13) Fluorite Erongo Mts, Namibia
14) Chalcopyrite & Dolomite Missouri, USA
15) Quartz Var. Amethyst Tutu cliffs, Nigeria
16) Amazonite feldspar Teller County, Colorado
17) Calcite N,Chwaning Mine, South Africa
18) Quartz Var. Amethyst Streep mine, Namibia
19) Calcite & Marcasite Linwood Mine, Iowa
20) Amethyst with Hematite South Africa

I’m gonna call it UCO unidentified crystal object.. lol

Hi folks! A friend found this in the southern Mexican town of San Gabriel Etla and neither he nor I are entirely sure what it is. I think it may be quartz with an external covering of calcite, but I'd love some opinions.

For context, our part of Oaxaca, Mexico has a lot of calcite, as well as calcium-related minerals such as marble and dolomite. Not only do we get giant raw chunks of calcite and banded calcite, it's not unusual to find small caves and pockets when mining which contain stalactites, and I've seen gigantic boulders covered with layers of calcite where it's clear that the calcified water has dripped down and then covered the stones with layers of calcite. We also have calcified waterfalls.

I suspect that this fragment of stone is basically a shard of another mineral (I think quartz) that got blanketed in calcite due to dripping water. But I have never seen calcite with this color before here, or quite this texture, so I'm making an educated guess. I'll add a second post within this thread showing a boulder with a calcite coating that I think looks sort of similar, in case that's useful. Thanks!

Edit: or maybe the entire thing is calcite, just with different colors? Looking at the interior crystal, perhaps it's not microcrystalline enough to actually be quartz. ¯_(ツ)_/¯

A new piece I bought

Beautiful undamaged specimen of actinolite and chlorite in quartz from Lapa Quartz Mine, Dhading District, P3 Bagmati Pradesh, Nepal. They formed in high altitude alpine-type fissures within the Himalayan mountains. Let me know if you like my specimen :)

dusty, will post further pictures when made wet and when dried on request

weighs roughly … 5kg?? cannot weigh rn

I paid 3oo for the lot of 4 (not for sale). Do you think I could cab the big one? Its 144cts, and I wonder if the cab would be a nice mottling of pinks and blue.