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Herderite
A valid IMA mineral species - grandfathered
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Colour:
Colourless, pale yellow, greenish-white; colourless in transmitted light.
Lustre:
Vitreous, Sub-Vitreous
Hardness:
5 - 5½
Specific Gravity:
3.02
Crystal System:
Monoclinic
Member of:
Name:
Named by Wilhelm Haidinger in 1828 in honor of Siegmund August Wolfgang von Herder (August 18, 1776 Germany - January 29, 1838 Dresden, Germany), Mining official in Freiberg, Germany.
Herderite-Hydroxylherderite Series. The fluorine-dominant analogue ofHydroxylherderite. Herderite is isotypic withDatolite.
Found usually as a pegmatite mineral formed during late-stage hydrothermal deposition.
Warning: Most specimens labeled "herderite" are in fact hydroxylherderite. True herderite probably does NOT occur at most of the localities listed here. Confirmed F-dominant specimens are presently known only from Brazil (two locations), Mogok, Yichun, and Namibia.
Visit gemdat.org forgemological information about Herderite.
Found usually as a pegmatite mineral formed during late-stage hydrothermal deposition.
Warning: Most specimens labeled "herderite" are in fact hydroxylherderite. True herderite probably does NOT occur at most of the localities listed here. Confirmed F-dominant specimens are presently known only from Brazil (two locations), Mogok, Yichun, and Namibia.
Visit gemdat.org forgemological information about Herderite.
![CaBe(PO4)F](#"/photo-420794.html"><img src="/image.pl?url=https%3a%2f%2fwww.mindat.org%2fimagecache%2fd0%2f4f%2f02700820017271923813228.jpg&f=jpg&w=240" alt="02700820017271923813228.jpg" /></a><div><b>Siegmund August Wolfgang von Herder</b></div></div></div><div><div><span>Formula:</span><div class=){kind=link}