Virgilite

Virgil E. Barnes

Formula:

LiAlSi₂O₆

Ideal formula; real formula is that of a solid-solution series.

Colour:

Colourless

Lustre:

Vitreous

Specific Gravity:

2.46 (Calculated)

Crystal System:

Hexagonal

Name:

Named by Bevan M. French, Peter A. Jezek, and Daniel E. Appleman in 1978 in honor of Virgil Everett Barnes (June 11, 1903, Chehalis, Washington - January 28, 1998, Austin, Texas), Professor of Mineralogy, University of Texas, Austin, Texas, USA. It recognizes his pioneering work on tektites and natural glasses and his collection/study of the material from Macusani, Peru (the type locality).

Co-Type Localities:

ⓘ Macusani, Carabaya Province, Puno, Peru
ⓘ Macusani glass, Macusani, Carabaya Province, Puno, Peru

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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)
0010668	Virgilite	Li C T (1968) The crystal structure of LiAlSi2O6 III (high-quartz solid solution) Zeitschrift fur Kristallographie 127 327-348		1968		0	293
0014849	Virgilite	Muller G, Paulus H, Stiefel J (1990) Synthesis and structure of beta-quartz type Na0.5H0.5AlSi206 as compared to LiAlSi206 Neues Jahrbuch fur Mineralogie, Monatshefte 1990 493-503		1990	synthetic	0	293

CIF Raw Data - click here to closedata_global _chemical_name_mineral 'Virgilite' loop_ _publ_author_name 'Li C T' _journal_name_full 'Zeitschrift fur Kristallographie' _journal_volume 127 _journal_year 1968 _journal_page_first 327 _journal_page_last 348 _publ_section_title ; The crystal structure of LiAlSi2O6 III (high-quartz solid solution) ; _database_code_amcsd 0010668 _chemical_formula_sum 'Li.333 (Al.333 Si.667) O2' _cell_length_a 5.217 _cell_length_b 5.217 _cell_length_c 5.464 _cell_angle_alpha 90 _cell_angle_beta 90 _cell_angle_gamma 120 _cell_volume 128.790 _exptl_crystal_density_diffrn 2.399 _symmetry_space_group_name_H-M 'P 62 2 2' loop_ _space_group_symop_operation_xyz 'x,y,z' 'x,x-y,1/3-z' 'x-y,x,1/3+z' 'y,x,2/3-z' '-y,x-y,2/3+z' '-x+y,y,-z' '-x,-y,z' '-x,-x+y,1/3-z' '-x+y,-x,1/3+z' '-y,-x,2/3-z' 'y,-x+y,2/3+z' 'x-y,-y,-z' loop_ _atom_site_label _atom_site_fract_x _atom_site_fract_y _atom_site_fract_z _atom_site_occupancy Li 0.00000 0.00000 0.00000 0.33330 Al 0.50000 0.00000 0.00000 0.33330 Si 0.50000 0.00000 0.00000 0.66670 O 0.20570 0.41140 0.50000 1.00000 loop_ _atom_site_aniso_label _atom_site_aniso_U_11 _atom_site_aniso_U_22 _atom_site_aniso_U_33 _atom_site_aniso_U_12 _atom_site_aniso_U_13 _atom_site_aniso_U_23 Li 0.00476 0.01065 0.07714 0.00538 0.00000 0.00000 Al 0.00434 0.00290 0.00272 0.00145 0.00000 0.00000 Si 0.00434 0.00290 0.00272 0.00145 0.00000 0.00000 O 0.01820 0.01944 0.02813 0.00972 0.01113 0.00000

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Localities for VirgiliteHide

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.

Peru (TL)
Puno Carabaya Province ⓘ Macusani (TL)	French et al. (1978) +1 other reference
ⓘ Macusani glass (TL)	French et al. (1978) +1 other reference