Glaze type · Surfaces & effects
Aventurine
Across 33 published recipes: mostly cone 04 and cone 5, fired in oxidation and reduction; Glossy, transparent.
Materials that define it
Share of recipes containing each material, and the typical amount when present. Materials link to their reference pages.
| Material | In recipes | Typical | Half of recipes |
|---|---|---|---|
| Red iron oxide | 85% | 20% | 15–22.75% |
| Silica | 79% | 20.7% | 11.85–25.75% |
| Bentonite | 46% | 2% | 1.63–2% |
| Lithium carbonate | 36% | 7.4% | 4.12–8.33% |
| Whiting | 27% | 10% | 4.5–11.54% |
| Kaolin | 24% | 7.15% | 4–14.75% |
| Ferro frit 3110 | 21% | 55.2% | 45.5–61% |
| Barium carbonate | 15% | 16% | 8.6–32% |
| Chrome oxide | 15% | 1.5% | 1.4–4.25% |
| Copper carbonate | 15% | 2% | 0.51–3% |
| EPK | 15% | 4.07% | 3.35–4.97% |
| Ferro frit 3134 | 15% | 39% | 6.75–68% |
| Nepheline syenite | 12% | 16.45% | 8.32–24.75% |
| Borax | 12% | 51.15% | 40.35–63.45% |
Typical fired chemistry
Median oxide analysis (weight %) across the recipes that report one, with the interquartile range. Silica and alumina set the melt; the fluxes and colorants make the family.
| Oxide | Median | Half of recipes |
|---|---|---|
| SiO2 | 43.49% | 30.81–51.48% |
| Al2O3 | 5.55% | 3.21–9.15% |
| B2O3 | 10.81% | 2.26–15.7% |
| Na2O | 7.67% | 6.07–9.74% |
| K2O | 1.5% | 0.58–3.69% |
| Li2O | 2.34% | 0.27–2.77% |
| CaO | 3.47% | 1.5–7.49% |
| Fe2O3 | 15.53% | 10.47–17.46% |
Related types
Questions
- What is a Aventurine glaze?
- In 33 published recipes, Aventurine glazes are mostly fired to cone 04 and cone 5 in oxidation and reduction, with a Glossy, transparent result. The defining materials are Red iron oxide, Silica, Bentonite, Lithium carbonate, Whiting.
- What cone is Aventurine fired to?
- The most common cones in published recipes are cone 04 and cone 5; the full distribution is on this page. Atmosphere matters as much as cone for this family: oxidation and reduction.
- What is the typical chemistry of a Aventurine glaze?
- Median fired analysis: SiO2 43.49%, Al2O3 5.55%, B2O3 10.81%, Na2O 7.67%, K2O 1.5%, Li2O 2.34%. Treat these as the centre of a range, not a target — the same family spans different fluxes and cones.
Sources. Every figure is a statistic computed by Claybench over 10,859 glaze recipes compiled from publicly shared community recipe collections (snapshot 2026-02-27); no recipe is reproduced. Colour-chemistry notes are paraphrased from Linda Arbuckle's Ceramic Materials handout.
Colorant and flux notes touch on materials with handling hazards (barium, cobalt, chrome, manganese, lead in historic recipes). Read each material's page and its supplier SDS before mixing; test any food surface.
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