Asked by Ke'Andre Dixon
do all minerals react to acid
All Answers 1
Answered by
GPT-5 mini
AI
No — not all minerals react with acid. Whether a mineral reacts depends on its chemistry.
Key points
- Carbonates (calcite, aragonite, dolomite, malachite, siderite) commonly react with dilute hydrochloric acid (HCl), producing CO2 gas and visible effervescence. Calcite gives a strong fizz with cold 10% HCl; dolomite and siderite typically fizz weakly unless powdered or warmed.
- Sulfides (pyrite, galena) generally do not fizz with cold HCl. They may be attacked by strong or oxidizing acids (e.g., HNO3) to form sulfates or sulfide decomposition products (sometimes H2S) but often require oxidation or heat.
- Silicates (quartz, feldspar, mica, olivine, pyroxene) and oxides (hematite, magnetite) are largely resistant to common acids like HCl. They can be attacked only by very aggressive reagents (e.g., hydrofluoric acid attacks silica) or extreme conditions.
- Halides and some soluble salts (halite, some sulfates) dissolve in water or acid without effervescence rather than bubbling.
- Some minerals react slowly, only when powdered or heated, or in presence of oxidizers.
Practical test used by geologists
- A drop of ~10% HCl on a fresh surface: strong fizz → carbonate mineral (calcite); weak fizz or only when powdered → dolomite/siderite. No fizz → likely silicate, oxide, or sulfide (requires other tests).
Safety
- Use dilute acid, eye/hand protection, and do tests in a well-ventilated area. Never use HF except with specialized lab safety and training — it dissolves glass and attacks silica and skin.
If you want, tell me which minerals you have (or a photo/description) and I can say which reaction to expect and how to test safely.
Key points
- Carbonates (calcite, aragonite, dolomite, malachite, siderite) commonly react with dilute hydrochloric acid (HCl), producing CO2 gas and visible effervescence. Calcite gives a strong fizz with cold 10% HCl; dolomite and siderite typically fizz weakly unless powdered or warmed.
- Sulfides (pyrite, galena) generally do not fizz with cold HCl. They may be attacked by strong or oxidizing acids (e.g., HNO3) to form sulfates or sulfide decomposition products (sometimes H2S) but often require oxidation or heat.
- Silicates (quartz, feldspar, mica, olivine, pyroxene) and oxides (hematite, magnetite) are largely resistant to common acids like HCl. They can be attacked only by very aggressive reagents (e.g., hydrofluoric acid attacks silica) or extreme conditions.
- Halides and some soluble salts (halite, some sulfates) dissolve in water or acid without effervescence rather than bubbling.
- Some minerals react slowly, only when powdered or heated, or in presence of oxidizers.
Practical test used by geologists
- A drop of ~10% HCl on a fresh surface: strong fizz → carbonate mineral (calcite); weak fizz or only when powdered → dolomite/siderite. No fizz → likely silicate, oxide, or sulfide (requires other tests).
Safety
- Use dilute acid, eye/hand protection, and do tests in a well-ventilated area. Never use HF except with specialized lab safety and training — it dissolves glass and attacks silica and skin.
If you want, tell me which minerals you have (or a photo/description) and I can say which reaction to expect and how to test safely.
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