Goldmanite, a calcium vanadium silicate mineral of the garnet group, is an extremely rare mineral found in the Franklin Marble in close proximity to the Sterling Hill orebody and was obtained by miners working there. It occurs as tiny (0.5 mm), rounded crystals, associated with margarite, corundum, thortveitite, gahnite, grossular, and rutile, in an assemblage described under margarite. No measurements other than X-ray diffraction patterns and microprobe analyses were made. The approximate composition of the extant specimens varies from that of an aluminian, chromian goldmanite (approximately Ca3(V16Cr0.2Al0.2)(SiO4)3) to that of a vanadian,
chromian grossular (approximately Ca3(A11.4V0.5Cr0.1)(SiO4)3). The maximum V2O3 content is approximately 21 wt. %; FeO, MnO and MgO are all less than 0.5 wt. %. The studied specimens are the same ones first described as uvarovite by Frondel (1972) and later verified as goldmanite by Dunn and Frondel (1990). (Dunn, 1995)

 Location Found: Ogdensburg
 Year Discovered: 1963
 Formula: Ca3V23+(SiO4)3
 Essential Elements: Calcium, Oxygen, Silicon, Vanadium
 All Elements in Formula: Calcium, Oxygen, Silicon, Vanadium
 IMA Status: Approved 1963
 To find out more about this mineral at minDat's website, follow this link   Goldmanite

Dunn, Pete J. (1995). Franklin and Sterling Hill New Jersey: the world's most magnificent mineral deposits. Franklin, NJ.: The Franklin-Ogdensburg Mineralogical Society. p.362

The Picking Table References
 PT Issue and PageDescription / Comment
View IssueV. 32, No. 1 - Spring 1991, pg. 9An Uncommon Margarite/Corundum Assemblage From Sterling Hill, New Jersey, Pete J. Dunn, Clifford Frondel, Goldmanite (small description)
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