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Steacyite Group

A group of related mineral species

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Photos of Steacyite Group (133)Discuss Steacyite Group

Steacyite Group Gallery Search Photos of Steacyite Group

Edit Steacyite Group Add Synonym Edit CIF structures Clear Cache

Steacyite, etc.

Poudrette quarry, Mont Saint-Hilaire, La Vallée-du-Richelieu RCM, Montérégie, Québec, Canada

Steacyite

Água de Pau Volcano, São Miguel, Azores, Portugal

Steacyite

Aris Quarries, Aris, Windhoek Rural, Khomas Region, Namibia

Steacyite, etc.

Poudrette quarry, Mont Saint-Hilaire, La Vallée-du-Richelieu RCM, Montérégie, Québec, Canada

Steacyite

Água de Pau Volcano, São Miguel, Azores, Portugal

Steacyite

Aris Quarries, Aris, Windhoek Rural, Khomas Region, Namibia

Steacyite, etc.

Poudrette quarry, Mont Saint-Hilaire, La Vallée-du-Richelieu RCM, Montérégie, Québec, Canada

Steacyite

Água de Pau Volcano, São Miguel, Azores, Portugal

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About Steacyite GroupHide

See also the related ekanite (which has a different space group).

Unique IdentifiersHide

Mindat ID:

34954

Long-form identifier:

mindat:1:1:34954:3

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	Year	Locality	Temp (K)
0018511	Steacyite	Prichard P, Perrault G (1972) Structure cristalline de l'ekanite de St-Hilaire, P.Q. Acta Crystallographica B28 1994-1999	1972	Mont St-Hilaire, Quebec, Canada	293
0012357	Turkestanite	Kabalov Yu K, Sokolova E V, Pautov L A, Schneider J (1998) Crystal structure of a new mineral turkestanite: a calcium analogue of steacyite Crystallography Reports 43 584-588	1998	Dzhelisu massif, Alayskiy range, Tien Shan, Kyrgyzstan	293
0005955	Arapovite	Uvarova Y A, Sokolova E V, Hawthorne F C, Agakhanov A A, Pautov L A (2004) The crystal structure of arapovite, U4+(Ca,Na)2(K1-x_x)[Si8O20],x~0.5, a new mineral species of the steacyite group from the Dara-i-Pioz moraine, Tien-Shan Mountains, Tajikistan The Canadian Mineralogist 42 1005-1011	2004	Dara-i-Pioz moraine, Tien-Shan Mountains, Tajikistan	293

CIF Raw Data - click here to close

data_global
_chemical_name_mineral 'Steacyite'
loop_
_publ_author_name
'Prichard P'
'Perrault G'
_journal_name_full 'Acta Crystallographica, Section B'
_journal_volume 28 
_journal_year 1972
_journal_page_first 1994
_journal_page_last 1999
_publ_section_title
;
 Structure cristalline de l'ekanite de St-Hilaire, P.Q.
;
_database_code_amcsd 0018511
_chemical_compound_source 'Mont St-Hilaire, Quebec, Canada'
_chemical_formula_sum 'K.6 Na.9 Ca.74 Mn.2 Mg.04 Th.88 Ce.03 Pb.01 Si8 O20'
_cell_length_a 7.58
_cell_length_b 7.58
_cell_length_c 14.77
_cell_angle_alpha 90
_cell_angle_beta 90
_cell_angle_gamma 90
_cell_volume 848.631
_exptl_crystal_density_diffrn      3.291
_symmetry_space_group_name_H-M 'P 4/m c c'
loop_
_space_group_symop_operation_xyz
  'x,y,z'
  '-y,-x,1/2+z'
  'y,x,1/2-z'
  'y,-x,-z'
  '-y,x,z'
  'x,-y,1/2+z'
  '-x,y,1/2-z'
  'x,y,-z'
  '-x,-y,z'
  'y,x,1/2+z'
  '-y,-x,1/2-z'
  '-y,x,-z'
  'y,-x,z'
  '-x,y,1/2+z'
  'x,-y,1/2-z'
  '-x,-y,-z'
loop_
_atom_site_label
_atom_site_fract_x
_atom_site_fract_y
_atom_site_fract_z
_atom_site_occupancy
K   0.00000   0.00000   0.00000   0.60000
Na   0.00000   0.50000   0.25000   0.45000
Ca   0.00000   0.50000   0.25000   0.37000
Mn   0.00000   0.50000   0.25000   0.10000
Mg   0.00000   0.50000   0.25000   0.02000
Th   0.00000   0.00000   0.25000   0.88000
Ce   0.00000   0.00000   0.25000   0.03000
Pb   0.00000   0.00000   0.25000   0.01000
Si   0.26050   0.33600   0.10730   1.00000
O1   0.23050   0.33600   0.00000   1.00000
O2   0.45360   0.25710   0.13270   1.00000
O3   0.10810   0.24710   0.16320   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
K 0.02474 0.02474 0.02984 0.00000 0.00000 0.00000
Na 0.02387 0.01659 0.01879 0.00000 0.00000 0.00000
Ca 0.02387 0.01659 0.01879 0.00000 0.00000 0.00000
Mn 0.02387 0.01659 0.01879 0.00000 0.00000 0.00000
Mg 0.02387 0.01659 0.01879 0.00000 0.00000 0.00000
Th 0.01426 0.01426 0.01326 0.00000 0.00000 0.00000
Ce 0.01426 0.01426 0.01326 0.00000 0.00000 0.00000
Pb 0.01426 0.01426 0.01326 0.00000 0.00000 0.00000
Si 0.01426 0.01368 0.01326 -0.00029 0.00170 0.00113
O1 0.03755 0.03842 0.01326 0.00175 0.00000 0.00000
O2 0.01601 0.02358 0.03094 0.00262 0.00113 0.00340
O3 0.02096 0.01892 0.02542 -0.00087 0.00737 0.00907

Relationship of Steacyite Group to other SpeciesHide

Steacyite Group Members:

Arapovite	(K_1-x◻_x)(Ca,Na)₂U⁴⁺Si₈O₂₀ (x ~ 0.5)	Tet. 4/mmm (4/m 2/m 2/m) : P4/mcc
Iraqite-(La)	KCa₂(La,Ce,Th)Si₈O₂₀	Tet. 4/mmm (4/m 2/m 2/m) : P4/mcc
Steacyite	K_0.3(Na,Ca)₂ThSi₈O₂₀	Tet. 4/mmm (4/m 2/m 2/m) : P4/mcc
Turkestanite	(K,◻)(Ca,Na)₂ThSi₈O₂₀ · nH₂O	Tet. 4/mmm (4/m 2/m 2/m) : P4/mcc

Other InformationHide

Health Risks:

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

Steacyite Group in petrologyHide

An essential component of rock names highlighted in red, an accessory component in rock names highlighted in green.

Metamorphic rock
- Metasomatic-rock
  - Charoitite

Internet Links for Steacyite GroupHide

mindat.org URL:

https://www.mindat.org/min-34954.html
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References for Steacyite GroupHide

Reference List:

Perrault, G., Szymański, J. T. (1982) Steacyite, a new name and a re-evaluation of the nomenclature of "ekanite"-group minerals. The Canadian Mineralogist, 20 (1) 59-63

Stachowicz, M.; Bagiński, B.; Harlov, D. E.; Jokubauskas, P.; Kotowski, J.; Matyszczak, W.; Dąbrowska, A.; Macdonald, R. (2025) Multidisciplinary study of thorium mobility: formation of turkestanite and steacyite analogues, and structural insights using an XRD-directed microcrystal preparation technique. Acta Crystallographica Section B Structural Science, Crystal Engineering and Materials, 81 (4). 418-426 doi:10.1107/s2052520625004822

Localities for Steacyite GroupHide

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.


Brazil
Paraná Tijucas do Sul Morro Redondo complex ⓘ Papanduva pluton	[Turkestanite] Vilalva et al. (2010) +1 other reference

Canada
Québec Montérégie La Vallée-du-Richelieu RCM Mont Saint-Hilaire ⓘ Poudrette quarry (De-Mix quarry; Demix quarry; Uni-Mix quarry; Carrière Mont Saint-Hilaire; MSH)	[Steacyite] Perrault et al. (1982) +3 other references

Germany
Rhineland-Palatinate Mayen-Koblenz Mendig Mendig ⓘ In den Dellen quarries	[Turkestanite] in the collection of Christof Schäfer

Greenland
Kujalleq Igaliku Narsaarsuk Plateau ⓘ Narssârssuk pegmatite	[Steacyite] - (n.d.)
ⓘ Ilímaussaq complex	[Turkestanite] Sørensen (2001) +1 other reference
ⓘ Kangerluarsuk Fjord	[Turkestanite] Petersen et al. (1999)
ⓘ Turkestanite-narsarsukite occurrence	[Turkestanite] Petersen et al. (1999)

Guinea
Conakry Region ⓘ Los Archipelago (Los Islands)	[Steacyite] Parodi et al. (1987)
ⓘ Rouma Island	[Steacyite] Parodi et al. (1987) +4 other references

Iraq
Sulaymaniyah Governorate Pshdar District Qaladiza Hero ⓘ Shakhi-Rash Mountain	[Iraqite-(La)] Mineralogical Magazine

Japan
Ehime Prefecture Ochi District Iwagi Island ⓘ Mount Kuresaka	[Turkestanite] Imaoka et al. (2021) +1 other reference

Kyrgyzstan
Batken Region Batken District ⓘ Hodzha-Achkan (Hodjaachkan) massif	[Turkestanite] Pautov et al. (2013)
Sokh Valley Upper Khodzhaachkan River ⓘ Dzhelisu Massif	[Turkestanite] Pautov et al. (1997) +3 other references

Madagascar
Diana Ambanja District Antsirabe ⓘ Ambohimirahavavy Alkaline Complex	[Turkestanite] Estrade (2014)
ⓘ Ampasibitika	[Turkestanite] Estrade et al. (2014)

Namibia
Khomas Region Windhoek Rural Aris ⓘ Aris Quarries	[Steacyite] Joachim Esche collection (SEM-EDS-analysed) +3 other references

Portugal
Azores São Miguel ⓘ Água de Pau Volcano	[Steacyite] Chiappino et al. (2015)
Ribeira Grande ⓘ Pumice quarry	[Steacyite] Alves (n.d.)

Russia
Aldan Shield Chara and Tokko Rivers Confluence ⓘ Murunskii Massif	[Steacyite] Konev et al. (1996)
ⓘ Irkutskii area	[Steacyite] Kaneva +3 other references
ⓘ Sirenevyi Kamen' Deposit	[Steacyite] Pavel.M. Kartashov (n.d.) +1 other reference
ⓘ Yakutskiy district	[Steacyite] Kaneva +3 other references
Murmansk Oblast ⓘ Kukisvumchorr Mt	[Steacyite] Pekov et al. (2004)

Tajikistan
Districts of Republican Subordination ⓘ Dara-i-Pioz Massif	[Turkestanite] Pautov et al. (1997) +6 other references

USA
ⓘ North Carolina	[Steacyite]
ⓘ Henderson County	[Steacyite] Minerological Record 18: 361n
Virginia Augusta County West Augusta ⓘ Stoutameyer Branch (Stotameyer Creek)	[Steacyite] Robin D. Tibbit (deceased)

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