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Mineralpedia Details for Ludlamite

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Ludlamite

Ludlamite

Named for Henry Ludlam, an English mineral collector from London. Ludlamite is an uncommon mineral that is found in granite pegmatites, and is a common product of hydrothermally altered phosphates formed under reducing conditions. It can be found in many localities, however fine crystals and large amounts can be found in England, Germany, Serbia, Mexico, Brazil, Canada, Bolivia, Japan and the United States including here in the Black Hills of South Dakota at the Dan Patch, Ferguson, and Big Chief mines among a few others.

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

Formula
Fe2+3(PO4)2ยท4H2
Crystal System
Monoclinic 
Crystal Habit
Massive - Granular 
Cleavage
Perfect, Indistinct, None 
Luster
Vitreous (Glassy) 
Color
apple green, colorless, green, greenish white, light green 
Streak
white 
Class
Monoclinic - Prismatic 
Hardness
3.5 
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Ludlamite from Santa Eulalia, Chihuahua, Mexico

Ludlamite
            from Santa Eulalia, Chihuahua, Mexico

Light green, tranlucent, very lustrous platy crystals in aggregates to 1.4cm.

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Ludlamite from Huanuni mine, Dalance Prov., Oruro dept., Bolivia

Ludlamite
            from Huanuni mine, Dalance Prov., Oruro dept., Bolivia

Glassy green crystal to 1cm.

Apple green lustrous Ludlamite crystals to over 1.5cm.

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Ludlamite from San Antonio mine, Santa Eulalia, Chihuahua, Mexico

Ludlamite
            from San Antonio mine, Santa Eulalia, Chihuahua, Mexico

Apple green very nice crystals of Ludlamite to 8mm.

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Ludlamite from Morococala mine, Dalence, Oruro, Bolivia

Ludlamite
            from Morococala mine, Dalence, Oruro, Bolivia

Green platy spray to 2cm.

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