How to identify Rhodonite

To correctly identify Rhodonite (Rhodonite), check each of these features in order. Many rocks and minerals look alike, so cross-reference multiple properties before deciding.

Step-by-step identification

1. 1

   Color

   Overall color and any zoning or banding

   Pink to rose-red, often with black manganese oxide veins or dendrites. Can also be brownish-red.

2. 2

   Luster

   How the surface reflects light: metallic, vitreous, dull

   Vitreous (glassy) to pearly on cleavage surfaces.

3. 3

   Texture

   Grain size and surface feel: coarse, fine, glassy

   Typically massive, granular, or compact. Tumbled specimens will have a smooth, polished feel.

4. 4

   Crystal Form

   Shape of visible crystals or crystal faces

   Usually massive, granular, or compact. Well-formed crystals are rare and typically tabular or prismatic, belonging to the triclinic system.

5. 5

   Cleavage

   How it breaks: flat cleavage planes vs irregular fracture

   Perfect in two directions at nearly right angles (87° and 93°), which can be observed in fractured or unpolished specimens.

6. 6

   Geological Environment

   The rock formation and setting where it occurs

   Metamorphic manganese deposits, skarns, hydrothermal veins, and occasionally as a primary mineral in igneous rocks.

Key Facts

Hardness

5.5-6.5 (Mohs scale)

Specific Gravity

3.4-3.7 g/cm³

Crystal System

Triclinic

Color

Pink, rose-red, brownish-red, often with black manganese oxide inclusions

Luster

Vitreous to pearly

Transparency

Translucent to opaque

Fracture

Uneven to conchoidal

Cleavage

Perfect in two directions at 87° and 93°

Composition

Manganese inosilicate, MnSiO₃

Physical characteristics

• Crystal Habit: Typically massive, granular, or compact. Rarely as tabular or prismatic crystals.
• Cleavage Type: Perfect on {110} and {1-10} at nearly 90 degrees.
• Fracture Type: Uneven to conchoidal.
• Tenacity: Brittle.
• Luster Type: Vitreous to pearly on cleavage surfaces.

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