This is looking into a geode. The red colour at the end is caused by the light shining through from outside the stone. The crystals are quartz, except for the larger, white ones which are probably chalcedony.
External dimensions are 5",12.75cm high ; 51/2",13.75cm wide; 71/2",19cm deep.
Internal dimensions are 2",5cm high; 3",7cm wide; 5", 12.75 cm deep. All measurements are approximate.
Critique welcome. Veteran 365er, 2011 vintage. Only posting occasionally and irregularly now.
I'm an abstract photography enthusiast but not exclusively so.
Born in the...