How to identify Unidentifiable Rock

To correctly identify Unidentifiable Rock (N/A), 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

   Variable, as it is unidentifiable. Could be any color depending on its unknown composition.

2. 2

   Luster

   How the surface reflects light: metallic, vitreous, dull

   Variable, from dull to vitreous, metallic, or earthy, depending on its unknown composition.

3. 3

   Texture

   Grain size and surface feel: coarse, fine, glassy

   Variable, from fine-grained to coarse-grained, crystalline, amorphous, or clastic, depending on its unknown nature.

4. 4

   Crystal Form

   Shape of visible crystals or crystal faces

   N/A, as its mineralogical composition and crystal structure are unknown.

5. 5

   Cleavage

   How it breaks: flat cleavage planes vs irregular fracture

   N/A, as its mineralogical composition and cleavage planes are unknown.

6. 6

   Geological Environment

   The rock formation and setting where it occurs

   N/A, as its origin and formation environment are unknown.

Key Facts

Hardness

N/A (unknown)

Specific Gravity

N/A (unknown)

Crystal System

N/A (unknown)

Color

N/A (unknown)

Luster

N/A (unknown)

Transparency

N/A (unknown)

Fracture

N/A (unknown)

Cleavage

N/A (unknown)

Composition

N/A (unknown)

Physical characteristics

• Crystal Habit: N/A (unknown)
• Cleavage Type: N/A (unknown)
• Fracture Type: N/A (unknown)
• Tenacity: N/A (unknown)
• Luster Type: N/A (unknown)

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