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(Na,K)2CaTi2Si10O26 · 8H2O
Tan to white to colorless
Sub-Vitreous, Silky
Specific Gravity:
2.40 (Calculated)
Crystal System:
Named in honor of Donald D. Hogarth (b. 1929), professor in the Department of Earth Sciences, University of Ottawa, in recognition of his contributions to the mineralogy and geology of the Grenville Province, and to the nomenclature of the pyrochlore group.
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Classification of HogarthiteHide

Approval Year:

74 : PHYLLOSILICATES Modulated Layers
3 : Modulated Layers with joined strips

Physical Properties of HogarthiteHide

Sub-Vitreous, Silky
Satiny to silky to subvitreous
Tan to white to colorless
on {010}
Splintery, Hackly
2.40 g/cm3 (Calculated)

Chemical Properties of HogarthiteHide

(Na,K)2CaTi2Si10O26 · 8H2O
IMA Formula:
(Na,K)2CaTi2Si10O26 · 8H2O

Crystallography of HogarthiteHide

Crystal System:
Class (H-M):
2/m - Prismatic
Space Group:
Cell Parameters:
a = 10.1839(5) Å, b = 15.8244(6) Å, c = 9.1327(7) Å
β = 104.463(2)°
a:b:c = 0.644 : 1 : 0.577
Unit Cell V:
1425.1 ų
Bladed to blocky crystals, average 0.05 × 0.15 × 2 mm in size. Forming dense, radiating aggregates up to 0.5 × 3 mm in size. Crystals are elongate along [100], flattened on {010} and are bounded by the forms pinacoid {010} (dominant), pinacoid {100} (minor), and pinacoid {001} (minor).

X-Ray Powder DiffractionHide

Powder Diffraction Data:
8.835 (85)
7.913 (100)
6.849 (70)
5.526 (40)
4.336 (45)
3.514 (80)
3.426 (55)
2.792 (50)

Type Occurrence of HogarthiteHide

General Appearance of Type Material:
Dense, radiating crystal aggregates
Geological Setting of Type Material:
Metasomatically altered marble xenoliths in the Poudrette quarry, Mont Saint-Hilaire,Canada.
Associated Minerals at Type Locality:

Synonyms of HogarthiteHide

Related Minerals - Dana Grouping (8th Ed.)Hide · 3H2OMon.

Fluorescence of HogarthiteHide

Non-fluorescent under short-, medium-, and long-wave ultraviolet radiation.

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.

References for HogarthiteHide

Reference List:
Sort by Year (asc) | by Year (desc) | by Author (A-Z) | by Author (Z-A)
McDONALD, A.M., CHAO, G.Y., and TARASSOFF, P. (2011) Hogarthite, a new Na-Ca titanosilicate hydrate mineral from Mont Saint-Hilaire, Quebec. Program with abstracts GAC-MAC Annual meeting, Ottawa, May 2011.
IMA approvals IMA 2009-043 - September 2009 former MSH UK75
McDonald, A.M., Tarassoff, P., Chao, G.Y. (2015): Hogarthite, Na,K)2CaTi2Si10O26·8H2O, a new member of the lemoynite Group from Mont Saint-Hilaire, Québec: Characterization, crystal-structure determination, and origin. Canadian Mineralogist, 53, 13-30.

Internet Links for HogarthiteHide

Localities for HogarthiteHide

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 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 (eg from pseudomorphs.)

All localities listed without proper references should be considered as questionable.
Canada (TL)
  • Québec
    • Montérégie
      • La Vallée-du-Richelieu RCM
        • Mont Saint-Hilaire
MCDONALD, A.M., CHAO, G.Y., and TARASSOFF, P. (2011) Hogarthite, a new Na-Ca titanosilicate hydrate mineral from Mont Saint-Hilaire, Quebec. Program with abstracts GAC-MAC Annual meeting, Ottawa, May 2011.
Mineral and/or Locality  
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