<a href="https://en.wikipedia.org/wiki/Groutite" class="extiw" title="en:Groutite">Groutite</a>
<dl><dd><dl><dd>Locality: Emilie Mine (Bülten-Adenstedt Mine), <a href="https://en.wikipedia.org/wiki/Peine" class="extiw" title="en:Peine">Peine</a>, <a href="https://en.wikipedia.org/wiki/Lower_Saxony" class="extiw" title="en:Lower Saxony">Lower Saxony</a>, Germany (<a rel="nofollow" class="external text" href="http://www.mindat.org/loc-7065.html">Locality at mindat.org</a>)</dd>
<dd>Size: small cabinet, 9.5 x 4.8 x 4.2 cm
<dl><dt>Groutite</dt></dl></dd>
<dd>This is an OUTSTANDING specimen of crystallized groutite in huge crystals and in a rich quantity, as well. The clusters of crystals measure to 1 cm and are richly scattered about a hollow vug inside this manganese nodule. The overall specimen is important for the species, but also interesting for how it shows the crystals formed, inside a hollowed nodule of the elemental manganese. It displays nicely from either angle, vertical or horizontal. When I first saw this specimen I was sure it was perhaps manganite or some other species, as groutite seldom forms such large crystals , nor such rich masses from other locations! But then I remembered I had one such before, as well. They are rare, and seldom seen. Also, the lustre on these crystals is quite good. From an old German collection recently starting to be sold...</dd></dl></dd></dl>
<bdi><a href="https://www.wikidata.org/wiki/Q56247090" class="extiw" title="d:Q56247090"><span title="mineral collector and dealer">Robert M. Lavinsky</span></a>
</bdi>
CC BY-SA 3.0
Image: <a rel="nofollow" class="external free" href="http://www.irocks.com/db_pics/new2010/tuc1048b.jpg">http://www.irocks.com/db_pics/new2010/tuc1048b.jpg</a>, Description: <a rel="nofollow" class="external free" href="http://www.irocks.com/render.html?species=Groutite&amp;page=1">http://www.irocks.com/render.html?species=Groutite&amp;page=1</a>