Florencite-(sm)
Florencite-(Sm)
A variety of Plumbogummite Group
What is Florencite-(sm)?
Florencite-(Sm) is a very rare mineral of the plumbogummite group (alunite supergroup) with simplified formula SmAl3(PO4)2(OH)6. Samarium in florencite-(Sm) is substituted by other rare earth elements, mostly neodymium. It does not form separate crystals, but is found as zones in florencite-(Ce), which is cerium-dominant member of the plumbogummite group. Florencite-(Sm) is also a samarium-analogue of florencite-(La) (lanthanum-dominant) and waylandite (bismuth-dominant), both being aluminium-rich minerals.
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Florencite-(sm) Localities Map
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Key Characteristics
Formation of Florencite-(sm)
Florencite-(Sm) was revealed in quartz veins in the Maldynyrd Range, Subpolar Urals, Russia. It associates with xenotime-(Y).
Quick Facts
Physical Properties
- Color
- Colourless
- Hardness (Mohs)
- 5.5 - 6
- Density
- 3.743 g/cm³
- Streak
- White
Chemical Properties
- Chemical Formula
- SmAl3(PO4)2(OH)6
- Elements
- Al, H, O, P, Sm
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