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Gyrolite information


Gyrolite
Spherical colorless gyrolite crystals from Malad quarry, India
General
CategoryPhyllosilicate
Formula
(repeating unit)		NaCa16(Si23Al)O60(OH)8·14H2O
IMA symbolGyr[1]
Strunz classification9.EE.30
Dana classification73.2.2c.1
Crystal systemTriclinic
Crystal classPinacoidal (1)
(same H-M symbol)
Space groupP1
Unit cella = 9.74, b = 9.74
c = 22.4 [Å]; α = 95.71°
β = 91.51°, γ = 120.01°; Z = 4
Identification
ColorWhite, colorless, green, yellow or brown
Crystal habitCompact, lamellar, platy
TwinningLamellar
CleavagePerfect on {001}
TenacityBrittle
Mohs scale hardness2+1⁄2
LusterVitreous, pearly
DiaphaneityTransparent, translucent, opaque
Density2.45–2.51
Optical propertiesBiaxial (−)
Refractive indexnα = 1.535 nβ = 1.548 nγ = 1.549
Birefringenceδ = 0.0140
References[2][3][4]

Gyrolite, NaCa16(Si23Al)O60(OH)8·14H2O,[3] is a rare silicate mineral (basic sodium calcium silicate hydrate: N-C-S-H, in cement chemist notation) belonging to the class of phyllosilicates. Gyrolite is also often associated with zeolites. It is most commonly found as spherical or radial formations in hydrothermally altered basalt and basaltic tuffs.[3] These formations can be glassy, dull or fibrous in appearance.[5]

Gyrolite is also known as centrallasite, glimmer zeolite or gurolite.[3]

  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. ^ "Gyrolite in the Handbook of Mineralogy" (PDF). Archived from the original (PDF) on 2022-01-25. Retrieved 2016-02-27.
  3. ^ a b c d "Gyrolite".
  4. ^ Dave Barthelmy. "Gyrolite Mineral Data".
  5. ^ "Gyrolite (Hydrated Calcium Silicate Hydroxide)". Galleries.com. Archived from the original on 2016-02-22. Retrieved 2016-02-27.

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