Goethite Iron Cap from Limestone Quarry, Hermannstein, Lahn Dill Area, Germany – miniature specimen as unique piece
This attractive specimen displays Goethite in the classic kidney ore habit. The surface consists of densely intergrown botryoidal structures with a silky to dull metallic luster. Its deep dark grey to black color and uniform botryoidal growth give the specimen a particularly decorative appearance. No crystals are developed; instead, the Goethite forms the characteristic rounded and concentrically layered surface typical of kidney ore specimens.
Geology & Origin
Goethite (FeO(OH)) is one of the most important iron hydroxide minerals and commonly forms as a weathering or oxidation product of iron-rich deposits. The Hermannstein locality in the Lahn-Dill district is part of one of Germany’s classic iron ore regions and is well known for high quality Goethite and Hematite occurrences. Kidney ore forms through the layered growth of countless fine concentric shells and is among the most sought-after habits of the mineral. This specimen is an excellent representative of this characteristic formation.
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
