Question
Identify the physical properties of minerals in terms of ,
Composition, luster, colour, streak, hardness, and cleavage or fracture
For the following minerals
1: pyroxene
2: pyrite
3: dioptase
4: hematite
5: magnetite
6: biotite
Respectively.
Composition, luster, colour, streak, hardness, and cleavage or fracture
For the following minerals
1: pyroxene
2: pyrite
3: dioptase
4: hematite
5: magnetite
6: biotite
Respectively.
Answers
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Answered by
GPT-4o mini
Certainly! Here are the physical properties of the minerals you specified:
### 1. Pyroxene
- **Composition:** Silicate mineral, typically containing calcium, magnesium, iron, and aluminum.
- **Luster:** Vitreous to dull.
- **Colour:** Typically dark green, black, or brown.
- **Streak:** White to colorless.
- **Hardness:** 5 to 7 on Mohs scale.
- **Cleavage or Fracture:** Cleavage in two directions at nearly 90 degrees; uneven fracture.
### 2. Pyrite
- **Composition:** Iron sulfide (FeS₂).
- **Luster:** Metallic.
- **Colour:** Brass-yellow (often referred to as "fool's gold").
- **Streak:** Greenish-black to brownish-black.
- **Hardness:** 6 to 6.5 on Mohs scale.
- **Cleavage or Fracture:** No true cleavage; conchoidal fracture.
### 3. Dioptase
- **Composition:** Hydrated copper silicate (CuSiO₃·H₂O).
- **Luster:** Vitreous.
- **Colour:** Bright green to blue-green.
- **Streak:** Green.
- **Hardness:** 5 to 5.5 on Mohs scale.
- **Cleavage or Fracture:** Perfect cleavage in one direction; conchoidal fracture.
### 4. Hematite
- **Composition:** Iron oxide (Fe₂O₃).
- **Luster:** Metallic to dull.
- **Colour:** Often reddish-brown or silver-gray.
- **Streak:** Reddish-brown.
- **Hardness:** 5 to 6 on Mohs scale.
- **Cleavage or Fracture:** No cleavage; uneven to sub-conchoidal fracture.
### 5. Magnetite
- **Composition:** Iron oxide (Fe₃O₄).
- **Luster:** Metallic.
- **Colour:** Black or steel-gray.
- **Streak:** Black.
- **Hardness:** 5.5 to 6.5 on Mohs scale.
- **Cleavage or Fracture:** No cleavage; uneven fracture.
### 6. Biotite
- **Composition:** Silicate mineral; a member of the mica group, with potassium, magnesium, iron, and aluminum.
- **Luster:** Vitreous to pearly.
- **Colour:** Dark brown to black, often with a bronze tint.
- **Streak:** White to pale brown.
- **Hardness:** 2.5 to 3 on Mohs scale.
- **Cleavage or Fracture:** Perfect cleavage in one direction, resulting in thin flexible sheets.
These properties provide useful information for the identification and classification of these commonly encountered minerals.
### 1. Pyroxene
- **Composition:** Silicate mineral, typically containing calcium, magnesium, iron, and aluminum.
- **Luster:** Vitreous to dull.
- **Colour:** Typically dark green, black, or brown.
- **Streak:** White to colorless.
- **Hardness:** 5 to 7 on Mohs scale.
- **Cleavage or Fracture:** Cleavage in two directions at nearly 90 degrees; uneven fracture.
### 2. Pyrite
- **Composition:** Iron sulfide (FeS₂).
- **Luster:** Metallic.
- **Colour:** Brass-yellow (often referred to as "fool's gold").
- **Streak:** Greenish-black to brownish-black.
- **Hardness:** 6 to 6.5 on Mohs scale.
- **Cleavage or Fracture:** No true cleavage; conchoidal fracture.
### 3. Dioptase
- **Composition:** Hydrated copper silicate (CuSiO₃·H₂O).
- **Luster:** Vitreous.
- **Colour:** Bright green to blue-green.
- **Streak:** Green.
- **Hardness:** 5 to 5.5 on Mohs scale.
- **Cleavage or Fracture:** Perfect cleavage in one direction; conchoidal fracture.
### 4. Hematite
- **Composition:** Iron oxide (Fe₂O₃).
- **Luster:** Metallic to dull.
- **Colour:** Often reddish-brown or silver-gray.
- **Streak:** Reddish-brown.
- **Hardness:** 5 to 6 on Mohs scale.
- **Cleavage or Fracture:** No cleavage; uneven to sub-conchoidal fracture.
### 5. Magnetite
- **Composition:** Iron oxide (Fe₃O₄).
- **Luster:** Metallic.
- **Colour:** Black or steel-gray.
- **Streak:** Black.
- **Hardness:** 5.5 to 6.5 on Mohs scale.
- **Cleavage or Fracture:** No cleavage; uneven fracture.
### 6. Biotite
- **Composition:** Silicate mineral; a member of the mica group, with potassium, magnesium, iron, and aluminum.
- **Luster:** Vitreous to pearly.
- **Colour:** Dark brown to black, often with a bronze tint.
- **Streak:** White to pale brown.
- **Hardness:** 2.5 to 3 on Mohs scale.
- **Cleavage or Fracture:** Perfect cleavage in one direction, resulting in thin flexible sheets.
These properties provide useful information for the identification and classification of these commonly encountered minerals.
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