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Formula: (Pb32O21)[(V,Si,Mo,As)O4]4Cl9
Lead oxychloride, vanadium-
molybdenum- and arsenic- bearing
mineral
Crystal System: Monoclinic
Specific gravity: 7.967 calculated for the empirical formula
Hardness: 2½
Colour: Orange-red
Environments
Sedimentary environments
Hydrothermal environments
Erikjonssonite is a relatively new mineral, approved in 2018 and to date (March 2024) reported only from the
type locality
Localities
The type locality for erikjonssonite, the Kombat Mine, Kombat, Otavi Constituency, Otjozondjupa Region, Namibia, is the
type locality for 16 mineral species including several lead oxychloride minerals:
kombatite, asisite,
damaraite,
vladkrivovichevite,
hereroite, janchevite and
erikjonssonite. Most of these minerals were discovered in late-stage zoned veins which are crosscutting the
primary hausmannite
ores.
Erikjonssonite is known only in a single specimen of hausmannite
rock. It occurs as thick tabular, anhedral to subhedral orange-red grains up to 0.3 x 0.5 x 0.5 mm3 in a
polymineral granular aggregate composed of hausmannite,
calcite and glaucochroite, as
well as accessory baryte, cerussite
and an insufficiently studied lead oxychloride. The last-mentioned mineral forms yellow-orange anhedral grains up to
0.2 mm across and seems to be chemically close to the kombatite endmember. It
differs from erikjonssonite in low contents of Si, Mo and As, as well as in lighter yellow-orange colour. No
other lead oxychlorides were found in this association
(EJM 31.3.619-628).
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