Rough crystals, 500 g — Clear quartz

The stone as the earth formed it, simply freed from its matrix and cleaned. Sharp edges, irregular faces, a matte or glassy luster depending on the vein.

Pure quartz, colorless, as transparent as water. The inclusions — veils, frost, phantoms — draw internal landscapes particular to each piece.

What tradition says. Considered the most versatile stone in crystal healing, it is credited with amplifying the intention entrusted to it and supporting other minerals. It is the crystal to begin with.

Use & care. Set it on a tray, in a bowl, next to a candle. Rough pieces sit well beside polished ones, by contrast. Rinse under clear water and dry; some soft materials cannot take water, check first.

• Quartz is the second most common mineral in the earth's crust; good clear pieces are nonetheless rare.
• A natural piece: shade, veining and dimensions vary from one example to the next

A decorative object for personal practice. It is no substitute for medical advice or treatment.