large, slender rock crystal from Brazil with an embedded crystal in the lower section

A slender rock crystal column from Brazil with a characteristic detail: a second, smaller crystal has grown into the lower part of the main column. A crystallographic encounter documented in the stone.

Rock crystal (SiO₂) is the purest variety of quartz. Such inclusion pieces are formed when, during the growth phase of the main column, a second crystal crystallized in the same cavity solution and was completely enclosed by the expanding quartz volume.

The slender shape of the main column and the inclusion make the piece a collector-relevant educational object. Mineralogists classify such constellations as growth inclusions; they are an indicator of complex solution conditions during crystallization.

Brazilian rock crystal deposits in Minas Gerais are the world's most productive source of clear quartz material. The clarity of the main column allows the inclusion of the inner crystal to be visually perceived directly.

A collector's item with a crystallographic inclusion narrative.