Fluorcaphite

Last updated
Fluorcaphite
Fluorcaphite-111341.jpg
General
Category Mineral
Formula
(repeating unit)		SrCaCa3(PO4)3F
Strunz classification 7/B.39-95
Crystal system Hexagonal
Crystal class Dipyrimidal
Space group P63 (No. 173)
Unit cell 545.39 Å3 (calculated from unit cell)
Identification
Formula mass 671.38
ColourLight to bright yellow
Crystal habit Prismatic, subhedral crystals
Fracture Sub-conchoidal
Tenacity Brittle
Mohs scale hardness5
Luster Vitreous
Streak White
Diaphaneity Transparent
Density 3.60
Birefringence 0.012

Fluorcaphite is a mineral with the chemical formula (Ca,Sr,Ce,Na)5(PO4)3F. [1] It is found in the Kola Peninsula in Russia. [2] Its crystals are hexagonal (dipyramidal class) and are transparent with a vitreous luster. It is light to bright yellow, leaves a white streak and is rated five on the Mohs Scale. [3] Fluorcaphite is radioactive. [1]

Related Research Articles

<span class="mw-page-title-main">Phosphate mineral</span> Nickel–Strunz 9 ed mineral class number 8 (isolated tetrahedral units, mainly)

Phosphate minerals contain the tetrahedrally coordinated phosphate (PO43−) anion, sometimes with arsenate (AsO43−) and vanadate (VO43−) substitutions, along with chloride (Cl−), fluoride (F−), and hydroxide (OH−) anions, that also fit into the crystal structure.

This list gives an overview of the classification of non-silicate minerals and includes mostly International Mineralogical Association (IMA) recognized minerals and its groupings. This list complements the List of minerals recognized by the International Mineralogical Association series of articles and List of minerals. Rocks, ores, mineral mixtures, not IMA approved minerals, not named minerals are mostly excluded. Mostly major groups only, or groupings used by New Dana Classification and Mindat.

<span class="mw-page-title-main">Raslakite</span>

Raslakite is a rare mineral of the eudialyte group with the chemical formula Na15Ca3Fe3(Na,Zr)3Zr3(Si,Nb)SiO(Si9O27)2(Si3O9)2(OH,H2O)3(Cl,OH). This formula is based on the original one, and is extended to show the presence of cyclic silicate groups. The additional silicon and oxygen shown in separation from the cyclic groups are in fact connected with two 9-fold rings. The mineral has lowered symmetry, similarly to some other eudialyte-group members: aqualite, labyrinthite, oneillite and voronkovite. The specific feature of raslakite is, among others, the presence of sodium and zirconium at the M2 site. Raslakite was named after Raslak Cirques located nearby the type locality.

The fluoride phosphates or phosphate fluorides are inorganic double salts that contain both fluoride and phosphate anions. In mineralogy, Hey's Chemical Index of Minerals groups these as 22.1. The Nickel-Strunz grouping is 8.BN.

References


This page is based on this Wikipedia article
Text is available under the CC BY-SA 4.0 license; additional terms may apply.
Images, videos and audio are available under their respective licenses.