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Well-Formed Yellowish Marialite

The Mineral marialite

Marialite is the sodium-rich end member of the Scapolite series. It is very similar and often indistinguishable from Meionite, the other end member of the series. Intermediary forms of Marialite and Meionite are frequent, and these are classified simply as Scapolite. Marialite is named after Maria Rosa von Rath, the wife of German mineralogist Gerhard von Rath (1830-1888).
Chemical Formula Na4(Al3Si9O24)Cl
Composition Sodium aluminum chloro-silicate
Variable Formula (Na,Ca)4(Al,Si)3Si6O24)(Cl,CO3,SO4)
Color White, gray, colorless, cream, yellow, bluish-gray, and purple. Less commonly blue, brown, green, red, and pink.
Streak White
Hardness 5.5 - 6
Crystal System Tetragonal
3D Crystal Atlas
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Crystal Forms
and Aggregates
Crystals are often short and stout with a slightly angled or pyramidal termination, or long and prismatic. Crystals can be very large and fat, and are often intergrown in groups of such crystals or are columnar. Also grainy, massive, and crudely as formed crystal masses. Prismatic crystals are often striated.
Transparency Transparent to opaque
Specific Gravity 2.5 - 2.6
Luster Vitreous to dull
Cleavage 2,2
Fracture Conchoidal, uneven
Tenacity Brittle
Other ID Marks Often fluorescent, sometimes brightly. Colors include white, yellow, and pink. Fluorescence may be present both in shortwave and longwave.
In Group Silicates; Tectosilicates
Striking Features Crystal habit, environment, and fluorescence
Environment In volcanic rock such as basalt, and in metamorphic rocks such metamorphosed limestones, skarns, gneisses, and hornfels. Also in granite pegmatites.
Rock Type Igneous, Metamorphic
Popularity (1-4) 3
Prevalence (1-3) 2
Demand (1-3) 2

Marialite AUCTIONS

The two Scapolite members often occur together and are not usually individually distinguished. See Scapolite for a comprehensive list of localities general to the Scapolite series.

Diopside, Calcite, Biotite, Phlogopite, Titanite, Hornblende, Actinolite, Tremolite, Almandine, Microcline, Albite, Muscovite

Meionite - Difficult to distinguish without chemical analysis.
Feldspars - Often form in different crystal habits, lacks fluorescence.
Nepheline - Different cleavage, lacks fluorescence.

marialite PHOTOS
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