Pollucite rare collector's mineral crystals combined with tourmaline 2228g, Afghanistan

Pollucite is a rare gemstone mineral belonging to the zeolite group. It contains large amounts of cesium and sometimes rubidium. Pollucite forms transparent colorless cubes, dodecahedrons or trapezoids and can also occur as fine-grained materials.
Interesting facts and rarity:

Pollucite is one of the richest natural sources of cesium in the world, yet its occurrence is extremely limited.

The most famous deposits are in Afghanistan, Pakistan, Canada and to a very limited extent also in Madagascar.

Pollucite crystals are mostly milky white to translucent, relatively fragile, but very attractive due to their color and contrast with the surrounding rock.

Collector's pieces with visible crystallization and combination with tourmaline are very valuable and appear on the market only rarely.

Pollucite is a rare cesium aluminosilicate, whose main importance lies in its high content of cesium – an extremely rare element used in electronics, optics and the nuclear industry. It occurs naturally in only a few locations in the world, usually in association with pegmatites, often in combination with lepidolite, tourmaline or albite.
Chemical formula:

(Cs,Na)₂Al₂Si₄O₁₂ · H₂O
Composition breakdown:

Cesium (Cs) – main element (often over 30% by weight)

Sodium (Na) – to a lesser extent replaces part of the cesium

Aluminum (Al)

Silicon (Si)

Oxygen (O)

Water (H₂O) – it is a hydrated silicate

Mineralogical classification:

Group: Tectosilicates (silicates with spatially bound SiO₄ tetrahedra)

System: Cubic (isometric)

Hardness: 6.5–7 (Mohs scale)

Density: approx. 2.8–3.0 g/cm³

Color: white, grayish-white, translucent to glassy

Thanks to its high cesium content, pollucite is not only a rare collector's mineral, but also a strategically important raw material, especially in electrical engineering and Its occurrence in crystalline form is extremely limited, making it a highly prized mineral among collectors.