- Dendritic Agate is a part of the big Chalcedony family. The chemical formula is SiO2. The
composition is silicon dioxide. This mineral has a level 7 hardness and a specific gravity of 2.6
- 2.7. Dendritic agate is probably the most amazing mineral of this family – because of its
beautiful patterns resembling trees or bushes, which may be strikingly realistic. These
patterns (usually black or brown, while the agate itself is white or light grey) are caused by
the manganese and iron oxide and hydroxide impurities.
- The best dendritic agates are mined in the northern part of Kazakhstan, one of the former
soviet republics. This stone looks especially good if it is cut as a thin cabochon, when the
trees are distinctly seen on the semi- transparent background. Sometimes the patterns form
landscapes, where one can imagine rivers, lakes or marshes, fields or forests, clouds etc.
Such agate pictures resemble the ancient Chinese paintings.