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Mineralpedia Details for Ludlockite

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Ludlockite

Ludlockite

Named after Frederik Ludlow (lud) Smith III and Charles Locke (lock) Key, who were American mineral dealers residing at the time in New Jersey, USA and provided the first specimens for analysis. Ludlockite is a rare mineral that occurs at its type locality at the Tsumeb mine in Namibia in sulfide ore from a polymetallic hydrothermal deposit. Other localities for Ludlockite include Greece, Italy, and Azerbaijan, among just a few others.

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

Formula
PbFe3+4As3+10O22 
Crystal System
Triclinic 
Crystal Habit
Acicular 
Cleavage
Good, Good, None 
Luster
Subadamantine 
Color
copper red 
Streak
light brown 
Class
Triclinic - Pinacoidal 
Fracture
Sectile 
Hardness
1.5-2 
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Ludlockite from Tsumeb mine, Tsumeb, Namibia

Ludlockite
            from Tsumeb mine, Tsumeb, Namibia

1. Flaming orange red fibrous crystals in aggregates to 1mm.

2. Fiery reddish orage fibrous sprays to 1mm in vuggy matrix.

3. Exceptional specimen of flaming reddish orange fibrous Ludlockite with associated silky white to Leiteite. Ludlockite occurs in two forms on this specimen: one, as thin bundles and radiating groups and two, as this deep red needledles to 5mm. 

Click thumbnail images for larger view.

Ludlockite from Veta Negra mine, Pampa Larga dist., Copiapó, Atacama Prov., Chile

Ludlockite
            from Veta Negra mine, Pampa Larga dist., Copiapó, Atacama Prov., Chile

Orange fibrous crystals flat on matrix. Interesting arsenate locality first discovered by Terry Szenics.

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