Siderophyllite
(repeating unit)KFe2+2Al(Al2Si2)O10(F,OH)2 IMA symbol Sid[1] Strunz classification 9.EC.21 Crystal system Monoclinic Crystal class Prismatic (2/m)
(same H-M symbol) Space group C2/m Unit cell a = 5.36 Å, b = 9.29 Å
c = 10.26 Å; β = 100.1°; Z = 2 Identification Color Blue green, dark brown, black. Crystal habit Micaceous foliated; pseudohexagonal crystals Cleavage Perfect basal Fracture Conchoidal Mohs scale hardness 2.5 Luster Vitreous to dull Streak Greenish gray Diaphaneity Transparent to subopaque Specific gravity 3 Optical properties Biaxial (-) Refractive index nα = 1.582 nβ = 1.625 nγ = 1.625 Birefringence δ = 0.043 2V angle 4° (measured) References [2][3][4] Micas Talcs Pyrophyllite series Kaolinites Serpentines Corrensites Smectites and vermiculite family Chlorites Allophanes Sepiolites Pyrosmalites Stilpnomelanes
(same H-M symbol)
c = 10.26 Å; β = 100.1°; Z = 2
Siderophyllite is a rare member of the mica group of silicate minerals with formula KFe2+2Al(Al2Si2)O10(F,OH)2.
The mineral occurs in nepheline syenite pegmatites and granite and aplite greisens. It is associated with microcline and astrophyllite at Pikes Peak, Colorado. It is also found in the alkali pegmatites of Mont Saint-Hilaire, Quebec.[4]
It was first described in 1880 for an occurrence near Pikes Peak, Colorado. The name derives from the Greek sideros, iron, and phyllon, leaf, in reference to its iron rich composition and perfect basal cleavage.[3]
References
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- Aluminoceladonite
- Anandite
- Annite
- Aspidolite
- Balestraite
- Bityite
- Biotite
- Boromuscovite
- Bramallite
- Celadonite
- Chernykhite
- Chromphyllite
- Clintonite
- Eastonite
- Ephesite
- Ferroaluminoceladonite
- Ferroceladonite
- Fluorannite
- Fluorokinoshitalite
- Fluorophlogopite
- Fluorotetraferriphlogopite
- Garmite
- Glauconite
- Gorbunovite
- Hendricksite
- Illite
- Kinoshitalite
- Lepidolite
- Luanshiweiite
- Manganiceladonite
- Margarite
- Masutomilite
- Montdorite
- Muscovite
- Nanpingite
- Norrishite
- Orlovite
- Oxyphlogopite
- Paragonite
- Phengite
- Phlogopite
- Polylithionite
- Preiswerkite
- Roscoelite
- Siderophyllite
- Suhailite
- Tainiolite
- Tetraferriannite
- Trilithionite
- Voloshinite
- Wonesite
- Yangzhumingite
- Minnesotaite
- Talc
- Willemseite
- Ferripyrophyllite
- Pyrophyllite
- Bismutoferrite
- Dickite
- Halloysite
- Hisingerite
- Kaolinite
- Nacrite
- Amesite
- Antigorite
- Berthierine
- Brindleyite
- Caryopilite
- Chrysotile
- Cronstedtite
- Fraipontite
- Greenalite
- Guidottiite
- Kellyite
- Lizardite
- Manandonite
- Népouite
- Odinite
- Pecoraite
- Beidellite
- Ferrosaponite
- Montmorillonite
- Nontronite
- Saponite
- Sauconite
- Swinefordite
- Vermiculite
- Volkonskoite
- Yakhontovite
- Allophane
- Chrysocolla
- Imogolite
- Neotocite
- Falcondoite
- Ferrisepiolite
- Sepiolite
- Friedelite
- Mcgillite
- Nelenite
- Pyrosmalite
- Schallerite
- Bannisterite
- Franklinphilite
- Lennilenapeite
- Parsettensite
- Stilpnomelane
- Structural groups mainly; based on rruff.info/ima, modified
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