RM3256 Childrenite and polythionite
Group of childrenite crystals, well defined, transparent to translucent, accompanied by aggregates of polythionite (mica group). They are disposed on a matrix with feldspar and quartz.
Size: 6.5 x 4.8 x 3.2 cm.
Main crystal: 5 mm.
Col J. Viñals. Col. E. Nicolau (Barcelona).
RM3271 Zanazziite
Druse formed by numerous globular aggregates of greenish-brown zanazziite disposed on a pegmatitic matrix with muscovite. Zanazziite is a rare hydrated calcium, magnesium, iron, aluminum and beryllium phosphate. With a handwritten label.
Size: 4.7 x 4.6 x 2.3 cm.
Col. E. Nicolau (Barcelona).
RM3001 Hydroxilherderite with albite
In this specimen we can observe numerous prismatic crystals of hydroxylherderite, an unusual calcium and beryllium hydroxylphosphate, with a very uniform beige color, very well defined faces and edges and with twinning. They are disposed on a matrix formed by albite crystals. The specimen is from the Piauí Valley, an area very rich in lithium-bearing pegmatites.
Size: 6.4 x 4.7 x 3.9 cm.
Main crystal: 1.4 cm.