FELDSPAR
Feldspar is an essential mineral acting as a fluxing agent. Mineastra offers Soda Feldspar and Potash Feldspar in Lumps, Grits, and Powder. Backed by 2,500–3,500 MT/month partner mine capacity, Mineastra ensures reliable Soda, Potash, and Mixed Feldspar supply for ceramics, glazes, and glass industries.
FELDSPAR
LUMPS
Potash Feldspar
Potash Feldspar Lumps (K-Feldspar)
SiO₂ (Silica):68 – 70%
Al₂O₃ (Alumina): 17 – 19%
K₂O (Potassium Oxide): 10 – 12%
Na₂O (Sodium Oxide): 2 – 4%
Fe₂O₃ (Iron Oxide) ≤ 0.05% (premium)
CaO + MgO ≤ 0.5%
Moisture < 0.5%'
Whiteness (after firing: )90 – 92% (brilliant white)
Whiteness (after firing): Pinkish to cream, blocky lumps
Applications
Ceramics & sanitaryware
Vitrified & porcelain tiles
Glass manufacturing (specialty glass)
Glazes & frits
Soda Feldspar
Soda Feldspar Lumps (Na-Feldspar)
SiO₂ (Silica): 68 – 70%
Al₂O₃ (Alumina): 18 – 20%
K₂O (Potassium Oxide): 2 – 4%
Na₂O (Sodium Oxide): 7 – 9%
Fe₂O₃ (Iron Oxide) ≤ 0.08%
CaO + MgO ≤ 0.7%
Moisture < 0.5%
Whiteness (after firing): 88 – 90% (off-white)
Whiteness (after firing): Off-white to bluish, blocky lumps
Applications
Container glass & flat glass
Ceramic tiles & sanitaryware
Electrical insulators
Glazes & frits
Physical Specifications
Size Fractions (Screened & Graded):
25 – 50 mm, 50 – 100 mm, 100 – 150 mm, 150 – 250 mm, 250 mm+Density / Bulk Density: 2.55 – 2.62 g/cm³
Hardness (Mohs): 6 – 6.5
Thermal Expansion: ~5 × 10⁻⁶ /°C
Sorting & Grading
Sorting Method: Manual handpicking, mechanized screening, optical color sorting (for premium potash/soda grades)
Impurity Control:
Potash: Low Fe₂O₃ for ceramics, sanitaryware, and premium glass
Soda: Strict control of Fe & Ti for glass industry demand
Industrial Mixed: Higher tolerance impurities, used in bulk/low-cost ceramics and refractories
Industrial / mixed color grade
Industrial / Mixed Color Feldspar Lumps
SiO₂ (Silica): 65 – 68%
Al₂O₃ (Alumina): 17 – 19%
K₂O (Potassium Oxide): 3 – 5%
Na₂O (Sodium Oxide): 4 – 6%
Fe₂O₃ (Iron Oxide) ≤ 0.15%
CaO + MgO ≤ 1.0%
Moisture < 0.5%
Whiteness (after firing): 75 – 85% (mixed tones, grey/brown specks)
Whiteness (after firing): Mixed white-grey with visible inclusions
Applications
Bulk ceramics (low-grade tiles, bricks)
Construction ceramics & fillers
Refractories
Low-grade glass
40–150 mm
RAW, ASSORTED STONES
Packaging & Supply
Packaging Options:
Jumbo Bags: 1 MT with liner
HDPE Woven Bags: 50 kg
Loose container loading for bulk buyers
Container Capacity: ~25 MT / 20 ft container
BROKEN DOWN, PROCESSED
FELDSPAR
GRITS
Potash Grits
Potash Feldspar Grits (K-Feldspar)
SiO₂ (Silica): 68 – 70%
Al₂O₃ (Alumina): 17 – 19%
K₂O (Potassium Oxide): 10 – 12%
Na₂O (Sodium Oxide): 2 – 4%
Fe₂O₃ (Iron Oxide): ≤ 0.05% (premium)
CaO + MgO: ≤ 0.5%
Moisture: < 0.3%
Whiteness (after firing): 90 – 92% (bright white)
Color / Appearance: Pinkish-white, angular grit sizes
Applications
Porcelain & vitrified tiles'
Sanitaryware ceramics
Glazes & frits
Specialty glass
Physical Specifications
Size Fractions (Screened & Graded):
0.1 – 0.3 mm, 0.3 – 0.6 mm, 0.6 – 1.2 mm, 1.2 – 2.5 mm, 2.5 – 4.0 mm, 4.0 – 6.0 mm, 6.0 – 10 mmDensity / Bulk Density: 2.55 – 2.62 g/cm³
Hardness (Mohs): 6 – 6.5
Thermal Expansion: ~5 × 10⁻⁶ /°C
Sorting & Grading
Sorting Method: Manual handpicking, optical sorting, or mechanized screening.
Sorting Method: Multi-stage crushing → screening → optical color sorting (premium grades)
Impurity Control:
Potash: Low Fe₂O₃ (<0.05%) for ceramics & glazes
Soda: Strict Fe/Ti removal for glass manufacturing
Soda Grits
Soda Feldspar Grits (Na-Feldspar)
SiO₂ (Silica): 68 – 70%
Al₂O₃ (Alumina): 18 – 20%
K₂O (Potassium Oxide): 2 – 4%
Na₂O (Sodium Oxide): 7 – 9%
Fe₂O₃ (Iron Oxide): ≤ 0.08%
CaO + MgO: ≤ 0.7%
Moisture: < 0.3%
Whiteness (after firing): 88 – 90% (off-white / bluish)
Color / Appearance: Off-white / bluish, angular grit
Applications
Container & flat glass
Ceramic tiles & sanitaryware
Electrical insulators
Glazes & frits
Packaging & Supply
Packaging Options:
Jumbo Bags: 1 MT with liner
HDPE Woven Bags: 50 kg
Loose container loading
Container Capacity: ~25 MT / 20 ft container
Supply Format: Consistent export-ready batches, screened & graded
FINE, MICRONISED
Potash
Potash Feldspar Powder (K-Feldspar)
SiO₂ (Silica): 68 – 70%
Al₂O₃ (Alumina): 17 – 19%
K₂O (Potassium Oxide): 10 – 12%
Na₂O (Sodium Oxide): 2 – 4%
Fe₂O₃ (Iron Oxide) ≤ 0.05% (premium)
CaO + MgO ≤ 0.5%
Moisture < 0.3%
Whiteness (after firing): 90 – 92% (bright white)
Color / Appearance: Fine, pinkish-to-cream powder
Applications:
Porcelain & vitrified tiles
Sanitaryware ceramics
Glazes & frits
Specialty glass
Physical Specifications
Particle Sizes (Micronized): D50 = 45 µm, 38 µm, 25 µm, 20 µm, 10 µm, 5 µm
Density / Bulk Density: 2.55 – 2.62 g/cm³
Hardness (Mohs): 6 – 6.5
Thermal Expansion: ~5 × 10⁻⁶ /°C
Sorting & Grading
Processing Method: Crushing → Ball mill / Pulverizing → Air separation → Micronized sieving
Impurity Control:
Potash: Ultra-low Fe₂O₃ for premium ceramics & porcelain
Soda: Fe/Ti controlled for glass and glaze industries
Soda
Soda Feldspar Powder (Na-Feldspar)
SiO₂ (Silica): 68 – 70%
Al₂O₃ (Alumina): 18 – 20%
K₂O (Potassium Oxide): 2 – 4%
Na₂O (Sodium Oxide): 7 – 9%
Fe₂O₃ (Iron Oxide) ≤ 0.08%
CaO + MgO ≤ 0.7%
Moisture < 0.3%
Whiteness (after firing): 88 – 90% (off-white / bluish)
Color / Appearance: Fine, off-white-to-bluish powder
Applications:
Container & flat glass
Ceramic tiles & sanitaryware
Electrical insulators
Glazes & frits
Packaging & Supply
Packaging Options:
HDPE Woven Bags: 25 kg / 50 kg
Jumbo Bags: 1 MT with liner
Custom bulk packaging for industrial users
Container Capacity: ~25 MT / 20 ft container
Supply Format: Export-ready, micronized powder, batch-certified