| Faizievite | |
|---|---|
| General | |
| Category | Silicate mineral,Cyclosilicate |
| Formula | K2Na(Ca6Na)Ti4Li6Si24O66F2 |
| IMA symbol | Fai[1] |
| Dana classification | 63.2.10.1 |
| Crystal system | Triclinic |
| Crystal class | Pinacoidal (1) (sameH-M symbol) |
| Space group | P1 |
| Unit cell | a = 9.82, b = 9.82 c = 17.31 [Å], α = 99.209(2)° β = 94.67(2)°, γ = 119.839(1)° (approximated); Z = 1 |
| Identification | |
| Color | Colorless |
| Crystal habit | tabular plates |
| Cleavage | None |
| Tenacity | Brittle |
| Mohs scale hardness | 4-4.5 |
| Luster | Vitreous |
| Diaphaneity | Opaque |
| Density | 2.83 (measured) |
| Optical properties | Biaxal (+) |
| Refractive index | np=1.65, nm=1.66 (approximated) |
| 2V angle | -72o (measured), -70o (calculated, approximated) |
| References | [2][3] |
Faizievite is a very rare mineral[3] with the formula K2Na(Ca6Na)Ti4Li6Si24O66F2.[2] This triclinic mineral is chemically related tobaratovite andkatayamalite.[4][5] Faizievite is a single-locality mineral, coming from the moraine of the Darai-Pioz glacier,Tien Shan Mountains, Tajikistan. Alkaline rocks of this site are famous for containing numerous rare minerals, often enriched in boron, caesium, lithium, titanium, rare earth elements, barium, and others.[6]
Faizievite was detected in quartz boulders, together withaegirine,baratovite,fluorite,leucosphenite,pectolite, andpolylithionite.[2]
Strontium and trace amounts ofrubidium,barium andniobium are present in the structure of faizievite. One of the sodium sites is partially vacant, and fluorine may be substituted by oxygen.[2]
Faizievite is related toberyl andosumilite groups of minerals.[3]
 | This article about a specificmineral ormineraloid is astub. You can help Wikipedia byexpanding it. |