Gyrolite (original) (raw)

A valid IMA mineral species - grandfathered

About GyroliteHide

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Formula:

NaCa16Si23AlO60(OH)8 · 14H2O

The crystal-chemical formula which accounts for
most gyrolite samples is Ca16Si24O60(OH)8.(14+x)H2O, with 0 < x < 3.

Colour:

Brown, Colorless, White, Green

Specific Gravity:

2.45 - 2.51

Name:

From the Greek guros = "circle", in allusion to the round form of the crystalline groupings

Unique IdentifiersHide

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Long-form identifier:

mindat:1:1:1785:1

4601f17d-fab1-4f4e-869f-77f3a56b6095

IMA Classification of GyroliteHide

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Approved, 'Grandfathered' (first described prior to 1959)

IMA Formula:

NaCa16(Si23Al)O60(OH)8 · 14H2O

Classification of GyroliteHide

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9.EE.30

9 : SILICATES (Germanates)
E : Phyllosilicates
E : Single tetrahedral nets of 6-membered rings connected by octahedral nets or octahedral bands

73.2.2c.1

73 : PHYLLOSILICATES Condensed Tetrahedral Sheets
2 : Condensed Tetrahedral Sheets with double and single layers

14.5.21

14 : Silicates not Containing Aluminum
5 : Silicates of Ca

Mineral SymbolsHide

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As of 2021 there are now IMA–CNMNC approved mineral symbols (abbreviations) for each mineral species, useful for tables and diagrams.

Please only use the official IMA–CNMNC symbol. Older variants are listed for historical use only.

Pronunciation of GyroliteHide

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Pronunciation:

Physical Properties of GyroliteHide

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Transparency:

Transparent, Translucent

Colour:

Brown, Colorless, White, Green

Fracture:

Irregular/Uneven

Density:

2.45 - 2.51 g/cm3 (Measured) 2.74 g/cm3 (Calculated)

Optical Data of GyroliteHide

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RI values:

_n_α = 1.535 _n_β = 1.548 _n_γ = 1.549

δ = 0.014

Image shows birefringence interference colour range (at 30µm thickness)
and does not take into account mineral colouration.

Chemistry of GyroliteHide

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Mindat Formula:

NaCa16Si23AlO60(OH)8 · 14H2O

The crystal-chemical formula which accounts for
most gyrolite samples is Ca16Si24O60(OH)8.(14+x)H2O, with 0 < x < 3.

Crystallography of GyroliteHide

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Class (H-M):

1 - Pinacoidal

Cell Parameters:

a = 9.74 Å, b = 9.74 Å, c = 22.4 Å
α = 95.71°, β = 91.51°, γ = 120.01°

Ratio:

a:b:c = 1 : 1 : 2.3

Unit Cell V:

1,823.86 ų (Calculated from Unit Cell)

Crystal StructureHide

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ID	Species	Reference	Link	Year	Locality	Pressure (GPa)	Temp (K)
0014488	Gyrolite	Merlino S (1988) Gyrolite: its crystal structure and crystal chemistry Mineralogical Magazine 52 377-387		1988	Qarusait, Greenland	0	293

CIF Raw Data - click here to close

X-Ray Powder DiffractionHide

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Radiation - Copper Kα

Data Set:

Data courtesy of RRUFF project at University of Arizona, used with permission.

Powder Diffraction Data:

Comments:

Mumbai, India. Data from Mackay and Taylor (1953).

Geological EnvironmentHide

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Geological Setting:

Hydrothermally altered basalt and basaltic tuffs

Type Occurrence of GyroliteHide

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Synonyms of GyroliteHide

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Other Language Names for GyroliteHide

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Relationship of Gyrolite to other SpeciesHide

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Other Members of this group:

Structurally related to group(s):

Common AssociatesHide

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Associated Minerals Based on Photo Data:

Related Minerals - Strunz-mindat GroupingHide

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Other InformationHide

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Health Risks:

No information on health risks for this material has been entered into the database. You should always treat mineral specimens with care.

Internet Links for GyroliteHide

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References for GyroliteHide

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Reference List:

Baltušnikas, A., Šiaučiūnas, R., Lukošiūtė, I., Baltakys, K., Eisinas, A., Kriūkienė, R. (2015) Crystal structure refinement of synthetic pure gyrolite. Materials Science: 21(1): 111-116.

Localities for GyroliteHide

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This map shows a selection of localities that have latitude and longitude coordinates recorded. Click on the symbol to view information about a locality. The symbol next to localities in the list can be used to jump to that position on the map.

Locality ListHide

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- This locality has map coordinates listed. - This locality has estimated coordinates. ⓘ - Click for references and further information on this occurrence. ? - Indicates mineral may be doubtful at this locality. - Good crystals or important locality for species. - World class for species or very significant. (TL) - Type Locality for a valid mineral species. (FRL) - First Recorded Locality for everything else (eg varieties). Struck out - Mineral was erroneously reported from this locality. Faded * - Never found at this locality but inferred to have existed at some point in the past (e.g. from pseudomorphs).

All localities listed without proper references should be considered as questionable.