Marialite information

Marialite
Marialite
General
Category	Tectosilicate
Formula; (repeating unit)	Na4Al3Si9O24Cl
IMA symbol	Mar
Strunz classification	9.FB.15
Crystal system	Tetragonal
Crystal class	Dipyramidal (4/m) ; (same H-M symbol)
Space group	I4/m
Unit cell	a = 12.06 Å, c = 7.572(3) Å; Z = 2
Identification
Color	Colorless, white, grey; pink, violet, blue, yellow, brown, orange-brown, pale green or reddish
Crystal habit	Typically flat, pyramidal striated crystals; massive, granular
Cleavage	Distinct on {100} and {110}
Fracture	Uneven to conchoidal
Tenacity	Brittle
Mohs scale hardness	5+1⁄2–6
Luster	Vitreous, pearly, resinous
Streak	White
Diaphaneity	Transparent to opaque
Specific gravity	2.55–2.74
Density	2.5–2.62 g/cm3
Optical properties	Uniaxial (−)
Refractive index	nω = 1.539–1.550 nε = 1.532–1.541
Birefringence	δ = 0.007 – 0.009
References

Marialite is a silicate mineral with a chemical formula of Na₄Al₃Si₉O₂₄Cl^[5]^[6] if a pure endmember or Na₄(AlSi₃O₈)₃(Cl₂,CO₃,SO₄) with increasing meionite content.^[3] Marialite is a member of the scapolite group and a solid solution exists between marialite and meionite, the calcium endmember.^[3] It is a rare mineral usually used as a collector's stone.

^ Warr, L.N. (2021). "IMA–CNMNC approved mineral symbols". Mineralogical Magazine. 85 (3): 291–320. Bibcode:2021MinM...85..291W. doi:10.1180/mgm.2021.43. S2CID 235729616.
^ Mineralienatlas
^ ^a ^b ^c Klein, C., and Dutrow, B. (2007) The 23rd Edition of the Manual of Mineral Science, 675 p. John Wiley and Sons, Inc. Hoboken, New Jersey, U.S.A.
^ Handbook of Mineralogy
^ ^a ^b Mindat.org
^ ^a ^b Webmineral data

[1] Warr, L.N. (2021). "IMA–CNMNC approved mineral symbols". Mineralogical Magazine. 85 (3): 291–320. Bibcode:2021MinM...85..291W. doi:10.1180/mgm.2021.43. S2CID 235729616.

[2] Mineralienatlas

[Klein-3] Klein, C., and Dutrow, B. (2007) The 23rd Edition of the Manual of Mineral Science, 675 p. John Wiley and Sons, Inc. Hoboken, New Jersey, U.S.A.

[HBM-4] Handbook of Mineralogy

[Mindat-5] Mindat.org

[Webmin-6] Webmineral data

Marialite information

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