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

GET FELDSPAR LUMPS QUOTE

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 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, 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

GET FELDSPAR GRTIS QUOTE

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

GET FELDSPAR GRITS QUOTE

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

FELDSPAR

POWDER