Location Found: Franklin
 Formula: ☐{Fe22+}{Fe52+}(Si8O22)(OH)2
 Essential Elements: Hydrogen, Iron, Oxygen, Silicon
 All Elements in Formula: Hydrogen, Iron, Oxygen, Silicon
 IMA Status: Valid - first described prior to 1959 (pre-IMA) - "Grandfathered"
 To find out more about this mineral at minDat's website, follow this link   Grunerite

The Picking Table References
 PT Issue and PageDescription / Comment
View IssueV. 46, Spring/Fall 2005, pg. 29Grunérite From Franklin, New Jersey
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