Classification of Hilgardite-3Tc |
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Physical Properties of Hilgardite-3Tc |
| Lustre: | Vitreous |
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| Diaphaneity (Transparency): | Transparent |
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| Colour: | Colourless; colourless in transmitted light |
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| Hardness (Mohs): | 5 |
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| Cleavage: | Perfect
On {010} and {100}. |
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Crystallography of Hilgardite-3Tc |
| Crystal System: | Triclinic |
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| Class (H-M): | 1 - Pedial |
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| Space Group: | P1 |
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| Cell Parameters: | a = 11.24Å, b = 22.28Å, c = 6.2Å
α = 90°, β = 90°, γ = 91.2° |
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| Ratio: | a:b:c = 0.504 : 1 : 0.278 |
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| Unit Cell Volume: | V 1,552.31 ų (Calculated from Unit Cell) |
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| Z: | 2 |
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| Morphology: | Only occurs as oriented intergrowths with hilgardite. The intergrowths are comprised of two partly merged individual crystals of Hilgardite-3Tc, one right-handed and one left-handed, in apparent twin position. These are attached by the positive end of [100] to (100) of a single Hilgardite crystal. Common forms include b, p, t. |
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Epitaxial Relationships of Hilgardite-3Tc |
| Epitaxial Minerals: | |
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| Epitaxi Comments: | Parahilgardite {100} [001] parallel with Hilgardite {100} [001], with the {010} cleavages of the two minerals inclined at 1°12'. |
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Optical Data of Hilgardite-3Tc |
| Type: | Biaxial (+) |
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| Dispersion: | r > v |
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Other Names for Hilgardite-3Tc |
| Synonyms: | |
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| Other Languages: | |
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Other Information |
| Health Warning: | No information on health risks for this material has been entered into the database. You should always treat mineral specimens with care. |
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References for Hilgardite-3Tc |
Reference List:
- + | Hurlbut (1938) American Mineralogist: 23: 765 (as Parahilgardite).
Palache, C., Berman, H., & Frondel, C. (1951), The System of Mineralogy of James Dwight Dana and Edward Salisbury Dana, Yale University 1837-1892, Volume II. John Wiley and Sons, Inc., New York, 7th edition, revised and enlarged: 383 (as Parahilgardite).
American Mineralogist (1985): 70: 636-637.
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