More to explore:
The speech of water, the speech of earth, and the speech of mud, are heard by those who listen with the heart. - Rumi, Masnavi. Mud pattern by g h i z i.
"Chrysanthemum rock" -- celestite crystals in a limestone matrix.
I have never seen these but would buy one in a minute! Quartz Lamps, Glow by cobalt123.
Boytroidal Chalcedony. Botryoidal (grape-like) structures manifest internally as "turtle-backing" or sometimes externally as "bubble-top" surfaces.
Opal: Fantastic up close detail of an Opal stone. Lines, shapes and colour. Incredible ideas forming in my head that need to get onto paper!!
Black Dendritic White Agate Drilled Stone Cabochon 47.5 ct
What a great way to store stones. @Bryn Donovan (I think you have a collection?)
Using Black Crystals - Black Onyx, Black Star Diopside, Jet, Smoky Quartz, Obsidian, Black Tourmaline
Large Black Moonstone Stone of the Dark Moon by Moondaughter