Ammoniojarosite crystals from Kalwang, Austria– micromount as unique piece
This micromount displays reddish-brown, weakly lustrous Ammoniojarosite crystals on a dark matrix. The crystals are short-prismatic to tabular in shape and scattered loosely across the surface. Their earthy tones contrast nicely with the matrix, giving the piece a naturally appealing appearance.
Ammoniojarosite is a rare ammonium iron sulfate typically forming under oxidizing conditions in sulfide-rich deposits. A member of the jarosite group, it is especially noted for associations with secondary sulfates. Well-defined crystals such as those seen here are uncommon in Central Europe and highly sought after for systematic collections.
Geology & Origin:
Kalwang in Styria, Austria, is a classic locality for iron-rich sulfate minerals. The deposit is part of a complex tectonic zone with hydrothermally influenced weathering environments. Ammoniojarosite forms here in oxidized zones above former sulfide-bearing ores – rarely producing macroscopic crystals like in this specimen.
This table is for general information and orientation, although the sizes of the stones may vary. In addition, this specification is handled differently from region to region.
Sizes
Description
approx. Sizes in mm/cm
approx. Sizes in INCH
Capsule
Capsule
0.1–0.5 mm in a transparent hard capsule (approx. 1 cm)
capsule contents 0.1–0.5 mm
capsule contents 0.004–0.02 in
TN/mm
Micromount (TN = Thumbnail)
everything fitting in a TN Perky box or a MM box of approx. 1 in
approx. 0.5–2.5 cm
max. 1 in
Min
Miniature specimen
will not fit a TN or MM box anymore
approx. 2.5–5 cm
approx. 0.2–1.0 in
Scab
small cabinet specimen
approx. one-third to half a hand size
approx. 5–9 cm
approx. 1.0–2.0 in
Cab
cabinet specimen
full hand size
approx. 9–15 cm
approx. 2.0–3.5 in
large Cab
large cabinet specimen
approx. two hand sizes
approx. 15–30 cm
approx. 3.5–6.0 in
very large Cab
very large cabinet specimen
everything larger, no upper limit
Abbreviations commonly used in mineralogy.
Abbreviation
Meaning
xl
single crystal, possible with matrix
xls
noticeable crystals
(xl)
embedded or damaged
(xls)
embedded or damaged
MASS
massive and/or amorphous pieces
TYP
type locality of the original description
SWUV
shortwave-UV-reaction
UV
ultraviolet reaction
SC
self-collected
U
unique (single unique piece)
Usage Instructions
This product is ideal as a collector's item, decorative element, teaching material, or for scientific and exhibition purposes.
Legal Notices
Safety
We accept no liability for damages resulting from improper and/or non-recommended use. Please carefully assess the suitability of the product before any alternative use.
Responsible Provider
Mikon Mineralienkontor GmbH Steinslieth 11 D-37130 Gleichen OT Klein Lengden
