is a rare inosilicate
mineral containing titanium, that is a member
of the Aenigmatite Group
of minerals that includes Aenigmatite, Krinovite, Kuratite
and Wilkinsonite. Aenigmatite is primarily found in peralkaline
volcanic rocks, pegmatites, and granites as well as silica-poor intrusive
rocks. It was first described and named in 1865 by German
mineralogist Johann Friedrich August Breithaupt
from an occurrence in the Ilimaussaq intrusive complex of southwest Greenland.
The name Aenigmatite
is from the Greek word
a riddle, in
allusion to the uncertain chemical composition of the mineral.
is typically opaque, velvet-black in color with vitreous
to greasy luster and often associated with bronze-brown
Astrophyllite crystals. Faceted gems are very rare.
Cabochons are somewhat more common but usually collected
for their flashy bronze Astrophyllite crystals and the
secondary black Aenigmatite crystals, if present, are
not even mentioned.
addition to the localities listed below, Aenigmatite was also reported from the Kaidun meteorite, possibly a Mars
meterorite, which landed on a Soviet military base near what is now Al-Khuraybah in Yemen
December 3, 1980.
notable studied occurrences include: at Naujakasik,
near the Tunugdliarfik Fjord, and on the Kangerdluarssuk
Plateau, in the Ilímaussaq intrusion; from Narssârssuk;
and elsewhere in Greenland. In the Khibiny and Lovozero
massifs, Kola Peninsula, Russia. At Sandefjord, Norway.
From Cuddua Mida, Sicily, Italy. In the USA, from Granite
Mountain, near Little Rock, Pulaski County, Arkansas,
and Santa Rosa, Sonoma County, California. In Australia,
from Warrumbungle volcano, Nandewar volcano, and the
Mt. Warning complex, New South Wales; and the Peak Range
Province, Queensland. From Logan Point quarry, Dunedin
volcano, New Zealand.
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