Related Clues:

• Mineral, mostly black and blue, collected by individual
• Windy river, confined in another river
• Orthorhombic rock-forming mineral
• Cage, metal, in dry lake
• Rock climber following one — look — on way up
• London lake
• Winding, twisting; mineral
• Winding river engulfs inept punter (university dropout)
• Fruit containing popular mineral
• Dark green mineral Newton discovered in rocky pine trees
• Mineral popular in Oman’s capital, as it happens
• What’s found in central Bolivia — one new mineral
• Like a winding path
• Observed point about acceptable speech taking a convoluted tack
• Snakelike; mineral