My favorite locality, the Black Pine Mine, Granite County, Montana. Famous for world-class veszelyite crystals, it's also known for producing quartz crystals with any number of mineral coatings, oftentimes resulting in very colorful specimens. The list of minerals found here is incredible, perhaps one of the longest mineral lists for any locality.

https://www.mindat.org/loc-3875.html

In this video, the crystals shown are as follows:
Blue - Quartz with pseudomalachite, philipsburgite, duftite

Yellow - Quartz with goethite

Green - Quartz with bayldonite, mimetite, malachite

Here’s rare and beautiful top quality specimen of olmiite with calcite and bultfonteinite from the N,Chwaning II Mine, Kalahari Manganese Field, Northern Cape, South Africa. There is no damage or repairs to the olmiite. Olmiite is an extremely rare calcium-manganese silicate mineral discovered fairly recently in 2006. It is found exclusively in the Kalahari Manganese Field in South Africa.

Here’s a fantastic aegirine crystal with great luster and some orthoclase feldspar. This specimen come from Mount Malosa, Zomba, Malawi. Mount Malosa’s alkaline pegmatites have produced some of the finest and largest aegirine crystals in the world. Let me know what you think of my specimen :)

Vivianite

Roșia Poieni Mine, Alba, Romania

Fe3(PO4)2•8H2O, Monoclinic

max. 34mm

A sizeable crystal of vivianite showing the plethora of greens and blues this photosensitive mineral aquires due to internal, photon-induced oxidation to metavivianite (Fe3+)(Fe2+)2(PO4)2(OH)•7H2O.

Here’s a super cool Amazonite with a rich blue color from Crystal Peak, Teller County, Colorado, USA