Plumbogummite
A variety of Plumbogummite Group
What is Plumbogummite?
Plumbogummite is a secondary mineral usually found in shades of blues, reds, greens, greys, and browns. This mineral is translucent and in the middle of the Mohs scale, which determines the hardness of a mineral. Plumbogummite is typically found alongside lead-bearing deposits in oxidized zones.
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Plumbogummite Localities Map
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Key Characteristics
Formation of Plumbogummite
The type locality is Huelgoat, Finistère, Brittany, France, and the type material is stored in the Natural History Museum, Paris, France. Plumbogummite has been found in the Central Cobar Mines, New South Wales, Australia and the Nifty Copper Mine, Western Australia. Also in the Kintore open cut at Broken Hill, New South Wales, Australia, but it is generally inconspicuous there and only a few specimens have been collected. Material from the Siglio XX Mine, Llallagua, Bolivia, is an unusual pale yellow color, rather than the more common blue or green, forming crusts on quartz and cassiterite, and enclosing crude octahedral jeanbandyite crystals with orange colored shells of plumbogummite.
Composition of Plumbogummite
The basic structural units of plumbogummite are PO4 tetrahedra, with phosphorus atoms (P) at the center and oxygen atoms (O) at the corners, together with AlO6 octahedra, aluminium atoms (Al) at the center and oxygen atoms at the corners. The tetrahedra and octahedra combine by sharing corners, to form composite layers. Lead atoms (Pb) occupy sites between the layers.
Health & Safety Information
- ⚠️Harm Reason: Plumbogummite dust is toxic because it contains heavy metals Lead.
- ⚠️Heavy Metal: Lead
- ⚠️How to prevent the risks of Plumbogummite?
Quick Facts
Physical Properties
- Color
- Light blue, gray-white, yellow-gray, yellow, yellow-brown, red-brown, greenish, bluish, dark blue-gray
- Hardness (Mohs)
- 4 - 5
- Density
- 4.08 g/cm³
- Streak
- Colourless to white
- Luster
- Resinous, Dull
- Crystal System
- Trigonal
Chemical Properties
- Chemical Formula
- PbAl3(PO4)(PO3OH)(OH)6
- Elements
- Al, H, O, P, Pb
Also Known As
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