Crystal Gypsum Supplier & Exporter — Selenite and Satin Spar
CaSO₄·2H₂O Crystalline Selenite · Uncalcined Dihydrate
Hand-selected crystal gypsum — transparent laminated selenite and fibrous satin spar — the purest naturally occurring form of calcium sulfate dihydrate, supplied to food, pharmaceutical, agricultural and decorative buyers. Uncalcined and unprocessed beyond selection and sizing, with a batch-specific Certificate of Analysis per shipment.
Selenite & Satin Spar
Physical Properties
Formula
CaSO₄·2H₂O
Habit
Selenite / Satin Spar
Mohs Hardness
2.0
Specific Gravity
2.31 – 2.33
Calcination
Not calcined
Refractive Index
1.520 – 1.530
Synonyms: Selenite, Satin Spar, Crystalline Gypsum, Transparent Gypsum, Maria Glass · Colourless to translucent crystal, cleaving into thin flexible sheets.
Grades & Chemical Analysis
Two natural crystal habits from the same deposit — laminated selenite sheets and fibrous satin spar. Both are uncalcined dihydrate at the top of the natural purity range, with the analysis certified per consignment.
Laminated Selenite — Transparent sheet habit
Selenite Crystal
- Mineral
- CaSO₄·2H₂O, uncalcined
- Habit
- Laminated transparent sheets
- Colour
- Colourless to translucent
- Lustre
- Vitreous to pearly
- Mohs Hardness
- 2.0
- Specific Gravity
- 2.31 – 2.33
- Calcination
- None — supplied as mined
- Purity & Oxide Analysis
- Certified per batch on CoA
- Sizing / Clarity Grading
- To buyer specification
- Test Method
- ASTM C471-M
Crystal gypsum is a hand-selected natural product. Purity and clarity vary between consignments, so a current sample analysis to ASTM C471-M-20 is issued for every shipment rather than a standing certificate. Sizing, sorting and clarity grading to buyer specification on request.
Bespoke Selection
Need a specific clarity, size or habit?
Crystal gypsum can be sorted by clarity, sheet thickness, fibre length and lump size to your specification. Tell us what your application needs and we will confirm availability, pricing and lead time.
Applications
Crystal gypsum is what you buy when the impurity profile of ordinary gypsum rock is the thing standing in your way.
Food Industry Calcium
Firming agent, tofu coagulant and dough conditioner.
Pharmaceutical Excipient
Calcium sulfate carrier and tablet filler.
Agriculture & Horticulture
High-purity calcium and sulfur without pH shift.
Decorative & Lapidary
Carving, ornament and specimen material.
Fine Art Plaster
Alabaster-quality casting after selective calcination.
Laboratory Reagent
Calcium sulfate standard and analytical reference.
Optical & Mineral Specimens
Cleavage plates for teaching and microscopy.
Premium Plaster Feedstock
Base for the whitest calcined plaster grades.
Paper & Cosmetics Filler
Bright, inert mineral filler.
Packaging, Logistics & Trading Terms
How we select, pack and ship crystal gypsum. Terms can be adapted by agreement — tell us what your operation needs.
- Minimum Order Quantity
- 1 × 20 ft container (approx. 25 MT). Smaller trial and sample lots can be arranged, since crystal gypsum is a selected rather than bulk product.
- Packaging
- Selected crystal in 1–1.5 MT jumbo bags or 25 kg bags; fragile clarity-graded material can be crate-packed with padding on request.
- Incoterms & Loading Ports
- EXW, FOB, CFR and CIF (Incoterms® 2020). Standard loading at Bandar Abbas and Bandar Imam Khomeini; other ports by arrangement.
- Quality Certification
- Batch-specific CoA with every shipment covering purity as CaSO₄·2H₂O, combined water, SO₃ and CaO, tested to ASTM C471-M-20.
- Lead Time
- 7–14 days for standard grades after order confirmation; 15–25 days for custom-milled or specially packed material.
- Storage & Handling
- Store dry and covered. Crystal gypsum is soft at Mohs 2 and cleaves easily, so avoid heavy stacking and rough handling if sheet integrity or clarity matters to your application.
Certificate of Analysis
A batch-specific CoA is issued with every shipment. Third-party inspection by SGS, Bureau Veritas or an inspector of your choice can be arranged at the buyer’s cost.
Ready to quote
Send us your grade, tonnage, destination port and packaging and we will return a firm FOB/CFR/CIF price with lead time.
Request a Crystal Gypsum Quote