Al2SiO5
Aluminum silicate · Kyanite, Sillimanite, Andalusite
Al2SiO5 is a stable, insulating aluminosilicate mineral widely recognized for its role in geological processes and high-temperature industrial materials.
About Aluminum silicate
Al2SiO5 is a prominent aluminosilicate that exists as a thermodynamically stable phase within the Earth's crust. As a wide-gap insulator, it possesses excellent thermal and chemical resilience, making it a foundational material in geological studies and industrial applications requiring high-temperature stability.
Due to its structural versatility, this compound is highly data-rich, with numerous reported configurations that highlight its importance in materials science. Its ability to maintain integrity under extreme conditions ensures its continued utility in specialized ceramic and refractory manufacturing.
Key Properties
Cross-validated computational properties for Aluminum silicate, aggregated across 4 databases.
Band GapEnergy needed to move an electron from the valence band to the conduction band. Lower or zero values tend to behave more metallic; larger gaps are more insulating or semiconducting.
Energy Above HullThermodynamic distance from the most stable set of competing phases. 0 eV/atom is on the convex hull; small positive values may still be experimentally accessible.
StabilityA plain-language summary of the best reported energy-above-hull result. It reflects whether the lowest-energy structure is on, near, or far from the stability hull.
StructuresCount of reported calculated crystal structures for this formula, including alternate polymorphs, source databases, and observed space groups.
Reported Structures
Lowest-energy structures reported for Al2SiO5, ranked by energy above hull.
| Space GroupSymmetry classification of the crystal arrangement. The number is the international space-group index. | Crystal SystemBroad lattice family, such as cubic, tetragonal, monoclinic, or triclinic, derived from unit-cell symmetry. | Band Gap (eV)Electronic gap calculated for this specific reported structure, measured in electronvolts. | E above hull (eV/atom)Thermodynamic distance from the convex hull for this structure, normalized per atom. Lower is generally more stable. | E/atom (eV)Computed total energy normalized per atom. Use energy above hull, not this value alone, when comparing stability. | Density (g/cm³)Mass per relaxed crystal volume, reported in grams per cubic centimeter. |
|---|---|---|---|---|---|
| P-1 (No. 2) | triclinic | 5.40 | 0.0000 | -8.084 | 3.68 |
| Pnnm (No. 58) | orthorhombic | 4.84 | 0.0020 | -8.082 | 3.16 |
| Pnma (No. 62) | orthorhombic | 4.99 | 0.0047 | -8.079 | 3.25 |
| Pm (No. 6) | monoclinic | 4.11 | 0.0544 | -8.029 | 3.02 |
| C2/c (No. 15) | monoclinic | 5.75 | 0.1019 | -7.982 | 3.87 |
| Cmcm (No. 63) | orthorhombic | 5.46 | 0.1108 | -7.973 | 3.54 |
| P-1 (No. 2) | triclinic | 4.07 | 0.2568 | -7.827 | 2.99 |
| P-1 (No. 2) | triclinic | 1.31 | 0.8496 | -7.234 | 1.71 |
| No. 0 | unknown | — | — | — | 1.83 |
| Pnnm (No. 58) | Orthorhombic | — | — | — | 3.05 |
| No. 0 | unknown | — | — | — | 1.83 |
| No. 0 | unknown | — | — | — | 1.83 |
Applications
Where Aluminum silicate is used.
Frequently Asked Questions
Common questions about Aluminum silicate, answered from cross-validated data.
What is Al2SiO5?
Al2SiO5 is a stable, insulating aluminosilicate mineral widely recognized for its role in geological processes and high-temperature industrial materials.
What is Al2SiO5 used for?
What is the band gap of Al2SiO5?
Is Al2SiO5 a metal, semiconductor, or insulator?
Is Al2SiO5 thermodynamically stable?
What is the crystal structure of Al2SiO5?
What is the density of Al2SiO5?
How many polymorphs of Al2SiO5 are known?
What elements does Al2SiO5 contain?
Where does the data for Al2SiO5 come from?
How It Compares
Within the aluminosilicates and zeolite frameworks class.
Unlike the more complex framework structures found in compounds like NaAlSi3O8 or the melilite-group Ca2Al2SiO7, Al2SiO5 is characterized by its distinct polymorphs, which allow it to serve as a critical pressure-temperature indicator in metamorphic petrology.
Related Compounds
Other Aluminosilicates and Zeolite Frameworks in the database.
Data sources & attribution
- materials_project — Data from the Materials Project. Cite: Jain et al., APL Materials 1, 011002 (2013).
- cod — Data from the Crystallography Open Database. Cite: Grazulis et al., Nucleic Acids Res. 40, D420 (2012).
- mpaloe — Data from mpaloe.
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