Anzaite-(Ce)
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| Anzaite-(Ce) | |
|---|---|
| General | |
| Category | Oxide mineral |
| Formula | Ce4Fe2+Ti6O18(OH)2 |
| IMA symbol | Anz-Ce[1] |
| Crystal system | Monoclinic |
| Crystal class | Prismatic (2/m) (same H-M symbol) |
| Space group | C2/m |
| Unit cell | a = 5.29, b = 14.58 c = 5.23 [Å]; β = 97.23° (approximated); Z = 1 |
| Identification | |
| Color | Grey |
| Crystal habit | Crystals (tiny) |
| Cleavage | None |
| Tenacity | Brittle |
| Mohs scale hardness | 6–6.5 |
| Diaphaneity | Opaque |
| Density | 5.05 (calculated; approximated) |
| References | [2][3] |
Anzaite-(Ce) is a rare-earth element (REE) oxide mineral with the formula Ce4Fe2+Ti6O18(OH)2.[2][3] An example of chemically related mineral is lucasite-(Ce),[4] although it contains no iron. Cerium in anzaite-(Ce) is mainly substituted by neodymium, lanthanum, calcium and praseodymium. Titanium is substituted by niobium. Trace elements include thorium. The mineral is monoclinic, space group C2/m. Anzaite-(Ce) is hydrothermal mineral found in a carbonatite from the mineralogically prolific Kola Peninsula. The mineral name honors Anatoly N. Zaitsev, who is known for studies of carbonatites and REE.[2][3]
Parent rocks for anzaite-(Ce) are silicocarbonatites of the Afrikanda alkali-ultramafic massif. These rocks underwent hydrothermal reworking, that beside anzaite-(Ce) produced also calcite, clinochlore, hibschite and titanite in expense of primary minerals.[2]
