Mineralpedia Details for Redledgeite

Named after its type locality at the Red Ledge mine in California. Redledgeite is a rare mineral that occurs on chrome ores in gold deposits at the Red Ledge locality. May also have Italian and Russian localities.  Redledgeite is associated with chromite, chromian clinochlore and knorringite.

Ref. Handbook of Mineralogy, Anthony et al (1995) and MSA at http://www.handbookofmineralogy.org/pdfs/redledgeite.pdf

Formula

Ba_xCr_2xTi⁴⁺_8-2xO₁₆ 

Crystal System

Tetragonal 

Cleavage

Good, None, None 

Luster

Adamantine 

Color

yellow green, black 

Streak

gray white 

Class

Tetragonal - Dipyramidal 

Hardness

6-7 

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Special Info

Type Locality

Green thin crusts of Redledgeite altered from Chromite ore associated with purple Clinochlore.

Black needles to 0.75mm in matrix. 

This occurence has been confirmed. The cluster of the Redledgeite is 10x18mm and there are other smaller clusters. The matrix is a dark green Clinochlore or a purple Diaspor and or Amesite. In-hand it is dark green. This is most likely the best occurence in the world out of the three reported. This occurence is the fourth and has not been documented. These crystals are a metallic green and reach about 6mm.

Also

Redledgeite occurs as black, needle-like crystals to 2mm. These are very large for the species. As like the type locality the Redledgeite also forms green hair-like crystals as seen in the photos. In addition this specimen is covered with good sized crystals of beautiful green Uvarovite crystals to 2.5mm but are mostly 1mm or less. There is also a large chromium Titanite crystal to 1.7mm and purplish Amesite.