Dims: 1.3" x 0.8" x 0.4" (3.3 x 2.0 x 1.0 cm)
Keywy, Kola Peninsula, Russia
This small thumbnail specimen consists of one of the only Staurolite specimens that we have found that contains a "cross" in which the crystals intersect each other at 90-degree angles- most that we find intersect each other at angles of 60-degrees. The specimen shows considerable damage, as one of the intersecting crystals is broken and not quite complete. Both crystals measure less than 1" (2.5 cm) in length and have a monoclinic prismatic form that is rounded and rather difficult to discern. They have the dark brown coloration that one expects of this mineral, and their luster is a dull waxy that is nearly matte. They are, of course, opaque. The "cross" rests in a matrix of highly compressed muscovite particles. There are a few other individual Staurlolite crystals present in the matrix, but these are all broken and incomplete.