Reddish crystals of analcime up to 1.8 cm in size on matrix
General
Category
Zeolite
Formula (repeating unit)
NaAlSi2O6 · H2O
IMA symbol
Anl
Strunz classification
9.GB.05
Crystal system
Orthorhombic
Crystal class
Dipyramidal (mmm) H-M symbol: (2/m 2/m 2/m)
Space group
Ibca
Identification
Formula mass
220.15
Color
White, colorless, gray, pink, greenish, yellowish
Crystal habit
Typically in crystals, usually trapezohedrons, also massive to granular.
Twinning
Polysynthetic on [001], [110]
Cleavage
Indistinct on {001}, {010}, {100}
Fracture
Uneven to subconchoidal
Mohs scale hardness
5–5.5
Luster
Vitreous
Streak
White
Diaphaneity
Transparent to subtransparent to translucent
Specific gravity
2.24–2.29
Optical properties
Isotropic; anomalously biaxial (−)
Refractive index
n = 1.479–1.493
Pleochroism
None
Ultraviolet fluorescence
Short UV = Greenish blueish white Long UV = Green, creamy white-yellow
Fusibility
3.5
Other characteristics
Weakly piezoelectric and pyroelectric; weakly electrostatic when rubbed or heated
Analcime (/əˈnælsiːm,-saɪm/; from Ancient Greek ἀνάλκιμος (análkimos) 'not strong') or analcite is a white, gray, or colorless tectosilicate mineral. Analcime consists of hydrated sodium aluminium silicate in cubic crystalline form. Its chemical formula is NaAlSi2O6 · H2O. Minor amounts of potassium and calcium substitute for sodium. A silver-bearing synthetic variety also exists (Ag-analcite). Analcime is usually classified as a zeolite mineral, but structurally and chemically it is more similar to the feldspathoids.[1] Analcime is not classified as an isometric crystal, as although the crystal structure appears to be isometric, it is usually off only by a fraction of an angle. However, there are truly isometric samples of the mineral, which makes its classification even more difficult.[2] Due to the differences between the samples being too slight, there's no merit from having multiple species names, so as a result analcime is a common example for minerals occurring in multiple crystal systems and space groups. It was first described by French geologist Déodat de Dolomieu, who called it zéolithe dure, meaning hard zeolite. It was found in lava in Cyclops, Italy. The mineral is IMA approved, and had been grandfathered, meaning the name analcime is believed to refer to a valid species til this day.[3]
^Cite error: The named reference :1 was invoked but never defined (see the help page).
^"Analcime (analcite): The zeolite mineral analcime information and pict". www.minerals.net. Retrieved 2022-12-29.
Analcime (/əˈnælsiːm, -saɪm/; from Ancient Greek ἀνάλκιμος (análkimos) 'not strong') or analcite is a white, gray, or colorless tectosilicate mineral....
southwestern Alberta, Canada. It is characterized by dominant analcime phenocrysts in a matrix of analcime, sanidine and alkalic pyroxene with accessory titanite...
nepheline, along with accessories including biotite, magnetite, ilmenite and analcime. Theralite is the intrusive equivalent of nepheline basanite, a foidal...
bauxite deposits; and with nepheline, gibbsite, diaspore, natrolite and analcime in nepheline pegmatites. Industrially, it is used as an inexpensive flame...
volcanic glass Teschenite – Type of igneous rock – A silica undersaturated, analcime bearing gabbro Theralite – Igneous rock – A nepheline gabbro Unakite –...
intrusive equivalents. Alkali gabbro usually contains olivine, nepheline, or analcime, up to 10% of the mineral content, while tholeiitic gabbro contains both...
(QAPF) classification of igneous rocks. Afghanite – Tectosilicate mineral Analcime – Tectosilicate mineral Cancrinite – Feldspathoid mineral Kalsilite – Vitreous...
caesium and sometimes rubidium. It forms a solid solution series with analcime. It crystallizes in the isometric-hexoctahedral crystal system as colorless...
In addition to analcime and melanite, common minerals include sanidine, aegerine-augite and chlorite. Blairmorite, a rare analcime-rich rock-type named...
plagioclase, olivine, clinopyroxene and likely very small amounts of leucite or analcime. An aphanitic (fine-grained) igneous rock is classified as trachybasalt...
Pongkao Kashima. Advanced Materials Research (Volume 664) ’Effects Of Analcime Zeolite Synthesized From Local Pottery Stone As Nucleating Agent On Crystallization...
orthoclase is replaced by a feldspathoid such as leucite, nepheline or analcime. Conversely in certain conditions, large volumes of anorthite crystals...
other micas, chlorite group minerals, quartz, zircon, certain feldspars, analcime, anatase, brookite, rutile, siderite and apatite. Xenotime is also known...
A sodium form, NaA), used in laundry detergents Na16Al16Si32O96·16H2O, Analcime, IUPAC code ANA Na12Al12Si12O48·q H2O, Losod Na384Al384Si384O1536·518H2O...
fillings in tuff and basalt. It occurs with cavansite, heulandite, stilbite, analcime, apophyllite and calcite. Warr, L.N. (2021). "IMA–CNMNC approved mineral...
Sabinaite Tan sabinaite crystals, porcelaneous analcime crystals on a siderite matrix General Category Carbonate mineral Formula (repeating unit) Na4Zr2TiO4(CO3)4...
association. Teschenite is a mixture of several minerals including titan-augite, analcime, various hornblendes, labradorite and in lesser quantities olivine. Teschenite...
Pongkao Kashima. Advanced Materials Research (Volume 664) ’Effects Of Analcime Zeolite Synthesized From Local Pottery Stone As Nucleating Agent On Crystallization...
hydrothermal veins and various mafic rocks. It occurs associated with thomsonite, analcime, natrolite, harmotome, brewsterite, prehnite and calcite. The mineral was...