is a rock forming mineral in contact metamorphic rocks
and skarns and some igneous rocks and ore bodies. It
is a common mineral but rarely found in the gem trade.
Hedenbergite is a member of the Pyroxene
Group of minerals that includes Aegirine,
and Spodumene. Hedenbergite
is usually much darker than its gemstone cousin Diopside.
It is mostly
opaque, rarely translucent and dark green to black.
It is also rarely found as fine needle inclusions in
quartz which makes for a very attractive gem.
few localities for studied material include: in Sweden,
at Nordmark, Värmland, and Yxsjö, Örebro. From Präagraten,
Tirol, Austria. At Fürstenberg, Saxony, Germany. From
Rio Marina, Elba, Italy. On Seriphos, Greece. In the
USA, at Iron Hill, Gunnison County, Colorado; fine crystals
from the Laxey mine, South Mountain, Owyhee Co., Idaho;
in the Pima district, Pima County, and the Westinghouse
mine, Santa Cruz County, Arizona; at Hanover, Grant
County, New Mexico. In the Vesturhorn intrusion, southeast
Iceland. Large crystals from Broken Hill, New South
Wales, Australia. In the Obira mine, Bungo, Oita Prefecture,
Japan. At Tirodi, Madhya Pradesh, and Kacharwali, Nagpur
district, Maharashtra, India. Fine crystals from the
Skardu area, Pakistan. At Dal'negorsk, Primorskiy Kray,