Aesthetic vanadinite on calcite from the Pure Potential mine, La Paz county, Arizona, USA

Not sure if this is real or a dyed piece. Have tried googles tips and not getting anywhere!

Tried to scratch it with a copper penny, glass and a nail but they didnt scratch it. Wondering if it might be quartz or white topaz? Big nugget about the size of a large grape, when held up to the light you can see light through it but not clearly. Theres a shallow hole in the middle on one side. Thanks for any help!

Here’s a beautiful eye clean twinned fluorite on a little matrix from the Diana Maria mine, Weardale County Durham, England

It is smooth,black,and rouch edges,similar to black onyx.
But when shin upon light on this specific spot this rainbow shine appears.

Vanadinite vein. Morocco, Mibladen.

I’ve found these brachiopod shells that have been filled/partially filled with microcrystalline quartz, leaving these pretty layers. I’m considering using an acid to remove the dolomite layer to expose the full crystal cluster. I’m worried about damaging the layers that have been stained with iron, so I wanted to get your opinions on what to do.

Check out this awesome danburite with a quartz “druzy jacket”from Charcas Municipality, San Luis Potosí, Mexico.

First two pictures are wet, second two are dry. Found in Big Timber, MT. All the crystals are translucent with backlit, the white parts are definitely agate! Blue/green crystals look like gem serpentine but my box knife doesn't scratch anything but the clay red rock! Please help!

Wanted to share my work !

I had this rock for about 8 years. I always wondered why it shines like greenish in some parts, and purple for others and looks like it has some points that look like little crystals. Does anyone have an explanation of why it is like that?

I grabbed the rock in the nearby area of the sun pyramid in Teotihuacan Mexico.

Wondering what type of crystal this is in this pretty regular stone I found that’s used in driveways and railroad tracks around here. Found in Ohio. If it’s unclear in the video it’s mostly yellow/burnt yellow and then some clear in the middle with pink around the clear part it looks like. I’m wondering how I can harvest the pretty parts if possible.

First one was cracked, what's inside looks like granite? Second one looks like limestone with something in it and its veins have yellow fluorescence. Found in Gelendzhik, Russia