How to identify Ocean Jasper

To correctly identify Ocean Jasper (Orbicular Chalcedony (a variety of Quartz)), 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

   Extremely variable, including shades of green, yellow, pink, red, white, brown, and gray. Often multicolored within a single specimen.

2. 2

   Luster

   How the surface reflects light: metallic, vitreous, dull

   Vitreous (glassy) to waxy.

3. 3

   Texture

   Grain size and surface feel: coarse, fine, glassy

   Smooth when polished; microgranular to cryptocrystalline.

4. 4

   Crystal Form

   Shape of visible crystals or crystal faces

   Microcrystalline aggregates, forming distinctive orbicular (spherical) patterns within a chalcedony matrix.

5. 5

   Cleavage

   How it breaks: flat cleavage planes vs irregular fracture

   None, due to its microcrystalline nature.

6. 6

   Geological Environment

   The rock formation and setting where it occurs

   Associated with rhyolitic or basaltic volcanic flows, specifically in coastal areas where silica-rich hydrothermal fluids have interacted with existing rock formations.

Key Facts

Hardness

7 on the Mohs scale.

Specific Gravity

2.58 - 2.64 g/cm³.

Crystal System

Trigonal (as microcrystalline quartz).

Color

Highly variable, often multicolored with orbicular patterns; green, yellow, pink, red, white, brown, gray.

Luster

Vitreous to waxy.

Transparency

Opaque to translucent.

Fracture

Conchoidal to uneven.

Cleavage

None.

Composition

Silicon dioxide (SiO2) with various mineral inclusions.

Physical characteristics

• Crystal Habit: Microcrystalline aggregates, forming spherulitic or orbicular structures within a massive chalcedony matrix.
• Cleavage Type: None.
• Fracture Type: Conchoidal to uneven.
• Tenacity: Brittle.
• Luster Type: Vitreous to waxy.

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