Killalaite

Type Locality Outcrop

Inishcrone, Killala Bay, Sligo County, Connacht, Ireland

Formula:

Ca_6.4(H_0.6Si₂O₇)₂(OH)₂

Originally assumed to be Ca₃(Si₂O₇).0.5H₂O.

Colour:

White, colorless in thin section

Specific Gravity:

2.94 (Calculated)

Crystal System:

Monoclinic

Name:

The mineral is named after the name of the locality, Killala Bay, and should be pronounced as killalahite.

Type Locality:

ⓘ Inishcrone, Killala Bay, Sligo County, Connacht, Ireland

Unique IdentifiersHide

IMA Classification of KillalaiteHide

Classification of KillalaiteHide

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Physical Properties of KillalaiteHide

Optical Data of KillalaiteHide

Type:

Biaxial (-)

RI values:

n_α = 1.634 - 1.635 n_β = 1.646 n_γ = 1.642 - 1.648

2V:

Measured: 26° (2), Calculated: 38°

Max Birefringence:

δ = 0.008 - 0.013

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

Surface Relief:

Moderate

Dispersion:

r > v

Chemistry of KillalaiteHide

Crystallography of KillalaiteHide

Crystal StructureHide

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Data courtesy of the American Mineralogist Crystal Structure Database. Click on an AMCSD ID to view structure

ID	Species	Reference	Link	Year	Locality	Pressure (GPa)	Temp (K)
0014467	Killalaite	Taylor H F W (1977) The crystal structure of killalaite Mineralogical Magazine 41 363-369		1977	Killala Bay, Ireland	0	293
0018997	Killalaite	Armbruster T, Lazic B, Galuskina I O, Galuskin E V, Gnos E, Marzec K M, Gazeev V M (2012) Trabzonite, Ca4[Si3O9(OH)]OH: crystal structure, revised formula, new occurrence and relation to killalaite Mineralogical Magazine 76 455-472		2012	Northern Caucasus, Russia	0	293

CIF Raw Data - click here to closedata_global _chemical_name_mineral 'Killalaite' loop_ _publ_author_name 'Taylor H F W' _journal_name_full 'Mineralogical Magazine' _journal_volume 41 _journal_year 1977 _journal_page_first 363 _journal_page_last 369 _publ_section_title ; The crystal structure of killalaite ; _database_code_amcsd 0014467 _chemical_compound_source 'Killala Bay, Ireland' _chemical_formula_sum 'Ca6.43 Si4 O17.14 H3.14' _cell_length_a 6.807 _cell_length_b 15.459 _cell_length_c 6.811 _cell_angle_alpha 90 _cell_angle_beta 97.76 _cell_angle_gamma 90 _cell_volume 710.154 _exptl_crystal_density_diffrn 3.028 _symmetry_space_group_name_H-M 'P 1 21/m 1' loop_ _space_group_symop_operation_xyz 'x,y,z' 'x,1/2-y,z' '-x,1/2+y,-z' '-x,-y,-z' loop_ _atom_site_label _atom_site_fract_x _atom_site_fract_y _atom_site_fract_z _atom_site_occupancy _atom_site_U_iso_or_equiv Ca1 0.33140 -0.09420 0.93080 1.00000 0.01570 Ca2 0.71900 -0.09960 0.33300 1.00000 0.02394 Ca3 0.01250 0.25000 0.33750 1.00000 0.02356 Ca4 0.92990 0.25000 0.83320 1.00000 0.02634 Ca5 0.52000 0.25000 0.48700 0.43000 0.01520 Si1 0.81310 -0.08740 0.83740 1.00000 0.01267 Si2 0.78040 0.08330 0.60080 1.00000 0.01178 O1 0.67700 -0.05870 0.00200 1.00000 0.01520 O2 0.69000 -0.14630 0.66200 1.00000 0.02406 O-H2 0.69000 -0.14630 0.66200 0.57000 0.02406 O3 0.00400 -0.14400 0.91900 1.00000 0.01267 O4 0.67200 0.04890 0.39200 1.00000 0.03420 O5 0.63300 0.13160 0.73100 1.00000 0.02026 O6 0.95700 0.15040 0.57600 1.00000 0.01393 O7 0.88400 0.00040 0.72700 1.00000 0.03166 O-H8 0.28000 0.25000 0.76200 1.00000 0.03800 O-H9 0.66000 0.25000 0.15600 1.00000 0.02533

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Type Occurrence of KillalaiteHide

Synonyms of KillalaiteHide

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Internet Links for KillalaiteHide

References for KillalaiteHide

Localities for KillalaiteHide

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

- 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.

Ireland (TL)
Connacht Sligo County Killala Bay ⓘ Inishcrone (TL)	Nawaz (1974) +1 other reference
Japan
Hiroshima Prefecture Shoubara City ⓘ Kushiro	Kusachi et al (1984)
Russia
Kabardino-Balkaria Baksan Valley Upper Chegem volcanic caldera (Verkhnechegemskaya caldera) ⓘ Lakargi Mountain	Armbruster et al. (2012)
ⓘ Xenolith no. 1	Galuskina et al. (2015)
ⓘ Xenolith no. 7	Armbruster et al. (2012)
Turkey
Rize Province ⓘ Güneyce-Ikizdere	Am Min 73:11-12 p 1497 +4 other references
UK
Northern Ireland Co. Antrim Larne Glenoe ⓘ Carneal	Nawaz (1977)