Dravite

Dravite is the magnesium-rich species of the tourmaline group, distinguished from iron-rich schorl by its warm brown, yellow-brown, and occasionally dark green hues. It was first described in 1884 from the Drava River region (Drau) of Carinthia, Austria, which gives the species its name.

Like all tourmalines, dravite forms trigonal prismatic crystals, often with rounded triangular cross-sections and strong lengthwise striations. It forms a continuous solid-solution series with schorl (iron) and uvite (calcium), so natural specimens often blend characteristics.

Most dravite is opaque to translucent, but clean transparent crystals are cut as collector gemstones showing rich cognac and golden-brown colors.

Dravite forms in magnesium-rich metamorphic environments, especially in metamorphosed limestones, dolomites, and magnesium-bearing schists and gneisses. The boron required to build tourmaline is typically introduced by fluids during regional or contact metamorphism.

It also occurs in some metasediments and in skarns where boron-bearing fluids react with carbonate rocks. Notable sources include Carinthia (Austria), Yinnietharra in Western Australia (famous for large brown crystals), Brazil, Kenya, Tanzania, and Sri Lanka.

Because tourmaline is chemically durable and hard, weathered dravite crystals also accumulate in alluvial gem gravels.

Look for warm brown to yellow-brown prismatic crystals with a rounded triangular (trigonal) cross-section and strong vertical striations along the length, classic tourmaline hallmarks. Hardness is 7-7.5, luster is vitreous, and the streak is white.

Dravite shows distinct pleochroism, appearing different shades of brown when viewed from different angles. Unlike schorl it tends toward brown rather than jet black, and unlike most quartz it lacks the hexagonal symmetry, showing the three-sided tourmaline cross-section instead.

Look-alikes include brown axinite, smoky quartz, and andalusite; the curved triangular cross-section, striations, and lack of cleavage help confirm tourmaline.

Dravite is mainly a collector and specimen mineral, valued for large, well-formed brown crystals such as those from Australia. Transparent material is faceted into warm cognac-colored gemstones, though it is less commercially prominent than pink or green tourmalines.

Its toughness and hardness make any cut stones durable for everyday jewelry. Bicolor and color-zoned dravite-uvite specimens are especially prized by collectors.

Metaphysically, brown tourmaline is associated with grounding, stability, and connection to the earth, though these properties are not scientifically established.