Question:

Rhodochrosite in hand specimen is most likely to be confused with certain varieties of:

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Always confirm rhodochrosite by acid reaction (effervesces in cold HCl) and higher specific gravity, which distinguishes it from feldspar.
Updated On: Aug 28, 2025
  • Wollastonite
  • Orthoclase
  • Gypsum
  • Biotite
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The Correct Option is B

Solution and Explanation

Step 1: Properties of Rhodochrosite.
Rhodochrosite (MnCO$_3$) is a carbonate mineral, typically pink to rose-red in color, with vitreous luster and perfect cleavage.

Step 2: Confusing mineral.
Orthoclase feldspar can also occur in pink varieties (commonly called "pink feldspar"), visually resembling rhodochrosite in hand specimen.

Step 3: Why not the others?
- Wollastonite: usually white/gray fibrous. - Gypsum: softer, transparent/white. - Biotite: dark brown/black mica.

Final Answer:
\[ \boxed{\text{Orthoclase}} \]

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