Hogarthite
A valid IMA mineral species
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Donald D. Hogarth
Formula:
(Na,K)2CaTi2Si10O26 · 8H2O
Colour:
Tan to white to colorless
Lustre:
Sub-Vitreous, Silky
Hardness:
4
Specific Gravity:
2.40 (Calculated)
Crystal System:
Monoclinic
Name:
Named in honor of Donald David Hogarth (1927, Toronto, Ontario, Canada - 4 December 2019, Canada), professor in the Department of Earth Sciences, University of Ottawa, Canada in recognition of his contributions to the mineralogy and geology of the Grenville Province, and to the nomenclature of the pyrochlore group.
Unique Identifiers
Mindat ID:
39669
Long-form identifier:
mindat:1:1:39669:3
IMA Classification of Hogarthite
Approved
IMA Formula:
(Na,K)2CaTi4+2Si10O26·8H2O
Approval year:
2009
First published:
2015
Type description reference:
Classification of Hogarthite
9.DP.35
9 : SILICATES (Germanates)
D : Inosilicates
P : Transitional ino-phyllosilicate structures
9 : SILICATES (Germanates)
D : Inosilicates
P : Transitional ino-phyllosilicate structures
74.3.4.4
74 : PHYLLOSILICATES Modulated Layers
3 : Modulated Layers with joined strips
74 : PHYLLOSILICATES Modulated Layers
3 : Modulated Layers with joined strips
Mineral Symbols
As of 2021 there are now IMA–CNMNC approved mineral symbols (abbreviations) for each mineral species, useful for tables and diagrams.
| Symbol | Source | Reference for Standard |
|---|---|---|
| Hog | IMA–CNMNC | Warr, L.N. (2021). IMA–CNMNC approved mineral symbols. Mineralogical Magazine, 85(3), 291-320. doi:10.1180/mgm.2021.43 |
Physical Properties of Hogarthite
Sub-Vitreous, Silky
Transparency:
Translucent
Comment:
Satiny to silky to subvitreous
Colour:
Tan to white to colorless
Streak:
White
Hardness:
4 on Mohs scale
Hardness Data:
Estimated
Comment:
Estimated
Tenacity:
Brittle
Cleavage:
Perfect
on {010}
on {010}
Fracture:
Splintery, Hackly
Density:
2.40(1) g/cm3 (Calculated)
Optical Data of Hogarthite
Type:
Biaxial (+)
RI values:
nα = 1.567(1) nβ = 1.591(1) nγ = 1.618(1)
2V:
Measured: 87° , Calculated: 88°
Max. Birefringence:
δ = 0.051
Based on recorded range of RI values above.
Based on recorded range of RI values above.
Interference Colours:
The colours simulate birefringence patterns seen in thin section under crossed polars. They do not take into account mineral colouration or opacity.
Michel-Levy Bar The default colours simulate the birefringence range for a 30 µm thin-section thickness. Adjust the slider to simulate a different thickness.
Grain Simulation You can rotate the grain simulation to show how this range might look as you rotated a sample under crossed polars. Each grain retains its interference colour (retardation) while its brightness falls to black at extinction and reaches a maximum between extinction positions.
The colours simulate birefringence patterns seen in thin section under crossed polars. They do not take into account mineral colouration or opacity.
Michel-Levy Bar The default colours simulate the birefringence range for a 30 µm thin-section thickness. Adjust the slider to simulate a different thickness.
Grain Simulation You can rotate the grain simulation to show how this range might look as you rotated a sample under crossed polars. Each grain retains its interference colour (retardation) while its brightness falls to black at extinction and reaches a maximum between extinction positions.
Surface Relief:
Moderate
Comments:
X = b, Y˄c = 15º (measured in the obtuse angle β), Z = a
Chemistry of Hogarthite
Mindat Formula:
(Na,K)2CaTi2Si10O26 · 8H2O
Element Weights:
Crystallography of Hogarthite
Crystal System:
Monoclinic
Class (H-M):
2/m - Prismatic
Space Group:
B2/m
Setting:
C2/m
Cell Parameters:
a = 10.1839(5) Å, b = 15.8244(6) Å, c = 9.1327(7) Å
β = 104.463(2)°
β = 104.463(2)°
Ratio:
a:b:c = 0.644 : 1 : 0.577
Unit Cell V:
1425.1 ų
Z:
2
Morphology:
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 Diffraction
Powder Diffraction Data:
| d-spacing | Intensity |
|---|---|
| 8.835 Å | (85) |
| 7.913 Å | (100) |
| 6.849 Å | (70) |
| 5.526 Å | (40) |
| 4.336 Å | (45) |
| 3.514 Å | (80) |
| 3.426 Å | (55) |
| 2.792 Å | (50) |
Reference:
Geological Environment
Paragenetic Mode(s):
| Paragenetic Mode | Earliest Age (Ga) |
|---|---|
| Stage 4b: Highly evolved igneous rocks | >3.0 |
| 35 : Ultra-alkali and agpaitic igneous rocks |
Type Occurrence of Hogarthite
General Appearance of Type Material:
Dense, radiating crystal aggregates
Place of Conservation of Type Material:
Canadian Museum of Nature (Gatineau, Canada), catalogue number CMNMC 86086.
Geological Setting of Type Material:
Metasomatically altered marble xenoliths in the Poudrette quarry, Mont Saint-Hilaire, Canada.
Associated Minerals at Type Locality:
Reference:
Synonyms of Hogarthite
Other Language Names for Hogarthite
Dutch:Hogarthiet
German:Hogarthit
Related Minerals - Strunz-mindat Grouping
| 9.DP.05 | Meliphanite | (Ca,Na)2(Be,Al)[Si2O6(OH,F)] |
| 9.DP.15 | Leucosphenite | BaNa4Ti2B2Si10O30 |
| 9.DP.20 | Ferriprehnite | Ca2Fe3+(Si3AlO10)(OH)2 |
| 9.DP.20 | Prehnite | Ca2Al2Si3O10(OH)2 |
| 9.DP.25 | Amstallite | CaAl[(Al,Si)4O8(OH)2](OH)2 · (H2O,Cl) |
| 9.DP.30 | Kvanefjeldite | Na4(Ca,Mn)(Si3O7)2(OH)2 |
| 9.DP.35 | Lemoynite | (Na,K)2CaZr2Si10O26 · 5H2O |
| 9.DP.35 | Natrolemoynite | Na4Zr2Si10O26 · 9H2O |
| 9.DP.40 | Altisite | Na3K6Ti2Al2Si8O26Cl3 |
| 9.DP.45 | Chiappinoite-(Y) | Y2Mn(Si3O7)4 |
| 9.DP.50 | Esquireite | BaSi6O13 · 7H2O |
| 9.DP.55 | Lavinskyite | K(LiCu)Cu6(Si4O11)2(OH)4 |
| 9.DP.55 | Plancheite | Cu8(Si8O22)(OH)4 · H2O |
Fluorescence of Hogarthite
Non-fluorescent under short-, medium-, and long-wave ultraviolet radiation.
Other Information
Notes:
No effervescence or noticeable solubility in dilute (1:10) HCl.
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 Hogarthite
mindat.org URL:
https://www.mindat.org/min-39669.html
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References for Hogarthite
Reference List:
Localities for Hogarthite
Showing 1 localities.
symbol to view information about a locality.
The Locality List
- 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).
All localities listed without proper references should be considered as questionable.
Canada (TL) | |
| MCDONALD et al. (2011) |
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