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Photo by @shonephoto (Robbie Shone) - A cave explorer ascends Titan shaft, the deepest natural shaft in the UK. In the 1770’s when nearby miners mined lead ore from inside Speedwell Cavern they must have passed below Titans great boulder pile, unaware of what giant void lay directly above them. It wasn’t until on New Years Day, 1999 when Titan was first discovered by local cave explorers, and it’s entire spender was illuminated for the very first time having been formed and sculptured in…
Wonderful lines and colours on the boulders of Huisinis Bay, North Harris. Dylan Nardini
Bands of black basic gneiss and grey acid gneiss were formed from igneous rocks more than 2000 million years ago. In a later event, they have been cut across by intrusions of pink granite. Near Loch Laxford, NW Scotland.
Lewisian Gneiss Rock, Isle of Lewis -the Geology of the Outer Hebrides is  important - as the predominant rock type is a Lewisian Gneiss - a metamorphic rock which is astonishingly up to 3 billion years old, making it the oldest rock in Britain - two thirds the age of the Earth.
This is the crystal cave of giants found in the Naica Mine, Chihuahua, Mexico. These are Selenite crystals (gypsum) and are the largest crystals ever discovered...  They are 1000 feet down in a limestone host rock, where they are mining for lead, zinc and silver.
Folded rock - evidence of continental drift.
Geological folding involves the plastic deformation (bending, buckling) of a single or multiple strata, such as sediments and rocks, which were originally horizontal surfaces. Although even brittle rocks may undergo plastic deformation when stresses are applied over considerable periods of time (low strain rate). Beyond plastic deformation, rocks fail structurally and faulting occurs.