Sillimanite is a common rock forming aluminosilicate, especially important for metamorphic petrology and ceramics industry. It is usually fibrous but it can form columnar crystals and even rare gemmy specimens.
Wollastonite is a common metamorphic silicate, mostly used in various industrial applications. Its nice crystal sprays and bright fluorescence make it also an interesting mineral specimen.
The Geomuseum in Fennefoss near Evje is a small hidden gem. Its not famous but it hosts a very interesting collection of minerals, mostly from local Evje-Iveland pegmatite field.
Arsenic is a semi-metal native element, which is famous for its toxicity. But native arsenic also forms interesting mineral specimens, often associated with silver minerals. And it is also important industrial metal.
Andalusite is a common aluminosilicate, which is very important for metamorphic petrology and ceramic industry. Despite its lack of perfect gemmy crystals, it can form outstanding specimens and rarely also faceted gemstones.
