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Mineral Index - X

• Xaga
  syn. of Obsidian

• Xalostocite
  syn. of Rosolite

• Xantharsenite
  syn. of Xanthoarsénite

• Xanthiosite
  Monoclinic
  Ni₃[AsO₄]₂

• Xanthitane
  Soft, friable, yellow earthy material as alteraton pseudomorphs after titanite (Green River, Henderson Co., NC, USA). Identical with anatase.

• Xanthite
  var. of Vesuvianite

• Xanthoarsénite
  var. of Sarkinite
  Mn₂(As,Sb)O₄OH

• Xanthochroite
  Glassy yellow crust of X-ray amorphous cadmium sulfide on gneiss. The name originally applied to earthy material that x-rayed as greenockite (Dana 7, vol 1, p. 230).
  Amorphous
  CdS

• Xanthochroitea
  syn. of Xanthochroite

• Xanthocone
  syn. of Xanthoconite

• Xanthoconite
  Monoclinic
  Ag₃AsS₃

• Xanthokon
  syn. of Xanthoconite

• Xantholite
  Shown to be an impure kaolinite. Originally reported from Millton, Glen Urquhart, North West Highlands (Inverness-shire), Scotland, UK.

• Xantholite (of Heddle)
  syn. of Xantholite

• Xanthophyllite
  syn. of Clintonite

• Xanthopyrites
  syn. of Pyrite

• Xanthorthite
  An Aluminosilicate of Ca, Fe and rare earths. Regarded as an altered Allanite, high in water, by E.S.Dana

• Xanthosiderite (of Schmid)
  syn. of Limonite

• Xanthosiderit (of Glocker)
  syn. of Copiapite

• Xanthotitane
  syn. of Anatase

• Xanthoxen
  syn. of Xanthoxenite (of Laubmann and Steinmetz)

• Xanthoxenite
  Triclinic
  Ca₄Fe³⁺₂[OH|(PO₄)₂]₂ · 3H₂O

• Xanthoxenite (of Frondel)
  syn. of Xanthoxenite

• Xanthoxenite (of Laubmann and Steinmetz)
  Probably identical with Stewartite.

• Xanthus
  syn. of Bloodstone

• Xantite
  syn. of Xanthite

• Xantofillite
  syn. of Clintonite

• Xa-phia
  syn. of Sapphire

• Xaphyllite
  syn. of Tetradymite

• Xenolite
  An uncertain material, probably Sillimanite. Originally described from St Petersburg, Leningradskaya Oblast', North-Western Region, Russia.
  Al₁₀Si₈O₃₁

• Xenophyllite
  Triclinic
  Na₄Fe²⁺₇[PO₄]₆

• Xenotime
  syn. of Xenotime-(Y)

• Xenotime Group
  group name
  Tetragonal

• Xenotime-(Y)
  Tetragonal
  YPO₄
• Xenotime-(Yb)
  Tetragonal
  (Yb,Y,HREE)PO₄

• Xenotimite
  syn. of Xenotime-(Y)

• Xenotim-(Y)
  syn. of Xenotime-(Y)

• Xenotim-(Yb)
  syn. of Xenotime-(Yb)

• Xenotlite
  syn. of Xonotlite

• Xeuxite
  syn. of Tourmaline

• Xiangjiangite
  Tetragonal
  (Fe³⁺,Al)(UO₂)₄[OH|(SO₄)₂|(PO₄)₂] · 22H₂O
• Xieite
  Orthorhombic
  Fe²⁺Cr₂O₄
• Xifengite
  Hexagonal
  Fe₅Si₃
• Xilingolite
  Monoclinic
  Pb₃Bi₂S₆
• Ximengite
  Trigonal
  BiPO₄

• Xingshaoite
  var. of Willemite
  (Zn,Co)₂[SiO₄]

• Xingzhongite
  Isometric
  (Pb,Cu,Fe)(Ir,Pt,Rh)₂S₄

• Xiphonite
  An insufficiently characterised amphibole that forms honey-yellow crystals in lava. Originally reported from Mt Etna, Etna Volcanic Complex, Catania Province, Sicily, Italy.

• Xitieshanite
  Monoclinic
  Fe³⁺[Cl|SO₄] · 6H₂O
• Xocolatlite
  Monoclinic
  Ca₂Mn⁴⁺₂Te⁶⁺₂O₁₂·H₂O
• Xocomecatlite
  Orthorhombic
  Cu₃[(OH)₄|TeO₄]

• Xofre
  syn. of Sulphur

• Xonaltite
  syn. of Xonotlite

• Xonolite
  syn. of Xonotlite

• Xonotlite
  Monoclinic
  Ca₆Si₆O₁₇(OH)₂

• Xonotlite Group
  group name

• Xrom
  syn. of Chromium

• Xylite
  Aluminosilicate of Ca, Mg and Fe Appears to be an altered actinolite asbestos, locality not known, probably from the Urals, Russia

• Xylochlore
  An olive-green variety of Apophyllite from Iceland

• Xylocryptite
  syn. of Mellite

• Xylolith
  syn. of Xylite

• Xyloretin
  syn. of Hartine

• Xyloretinite
  syn. of Hartine

• Xylotile
  Probably an altered asbestos
  (Mg,Fe)₃Fe₂Si₇O₂₀·10H₂O