Technical Data and Physical Characteristics
For Barton Garnet Abrasive Grains And Powders
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Mineral Characterization: Combination of Almandite and Pyrope varieties of garnet. |
General Description: Garnet, a homogeneous mineral, contains no free chemicals. All oxides and dioxides are combined chemically as follows: Fe2O3Al2(SiO4)3.
The iron and aluminum are partially replaceable by calcium, magnesium and manganese.
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Chemical Analysis:
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Silicon Dioxide |
(SiO2) |
41.34% |
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Ferrous Oxide |
(FeO) |
9.72% |
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Ferric Oxide |
(Fe2O3) |
12.55% |
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Aluminum Oxide |
(Al2O3) |
20.36% |
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Calcium Oxide |
(CaO) |
2.97% |
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Magnesium Oxide |
(MgO) |
12.35% |
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Manganese Oxide |
(MnO) |
.85% |
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100.14% | |
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Hardness: |
Between 7.5 and 8.5 on Mohs Scale. |
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Strength: |
Friable to tough. |
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Particle Shape: |
Sharp, angular, irregular. |
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Cleavage: |
Pronounced laminations, irregular cleavage planes. |
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Color: |
Red to pink. |
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Streaks: |
White. |
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Transparency: |
Translucent. |
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Lustre: |
Vitreous. |
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Specific Gravity: |
3.9 to 4.1. |
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Mean Refractive Index: |
1.83. |
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Facet Angles: |
37oC and 42oP. |
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Crystallization: |
Cubic (isometric) system as rhombic dodecahedrons or tetragonal trisoctahedrons (trapezohedrons) or in combinations of the two. |
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Melting Point: |
1,315oC - (2,399oF). |
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Magnetism: |
Slightly magnetic (volume susceptibility = 9.999375). Electrostatic Properties: a) Mineral conductivity - 18,000 volts. b) Non-reversible. |
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Moisture Absorbtion: |
Non-hygroscopic, inert. |
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Dispersion: |
Self-dispersing. |
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Uniformity: |
All garnet mineral in this Adirondack deposit was formed simultaneously under identical natural conditions and has been proven uniform throughout during over 100 years of use in technical abrasive applications. |
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Pathological Effects: |
None. |
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Harmful Free Silica Content: |
None (silicosis free). |
