How to identify Carved Stone Skull

To correctly identify Carved Stone Skull (Composite of various carved stones (e.g., Jasper, Sodalite, Aventurine, Obsidian, 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

   Highly variable, depending on the stone: Jasper (red, brown, green, yellow, multi-colored), Sodalite (blue, grey, white), Aventurine (green, blue, red, orange), Obsidian (black, dark brown, sometimes iridescent), Quartz (colorless, white, pink, purple, yellow, brown, smoky).

2. 2

   Luster

   How the surface reflects light: metallic, vitreous, dull

   Variable, depending on the stone: Jasper (dull to vitreous), Sodalite (vitreous to greasy), Aventurine (vitreous, often with a sparkly aventurescence), Obsidian (vitreous), Quartz (vitreous).

3. 3

   Texture

   Grain size and surface feel: coarse, fine, glassy

   Smooth and polished due to carving, but the inherent texture of the stone can be felt (e.g., glassy for obsidian, microcrystalline for jasper).

4. 4

   Crystal Form

   Shape of visible crystals or crystal faces

   The external form is an artificial skull shape. Internally, the crystal form is characteristic of the constituent stone (e.g., microcrystalline for Jasper, massive for Sodalite, amorphous for Obsidian, macrocrystalline for Quartz).

5. 5

   Cleavage

   How it breaks: flat cleavage planes vs irregular fracture

   Variable, depending on the stone: Jasper (none), Sodalite (poor to distinct, dodecahedral), Aventurine (none), Obsidian (none), Quartz (none).

6. 6

   Geological Environment

   The rock formation and setting where it occurs

   The geological environment is that of the source material: Jasper (sedimentary, volcanic, hydrothermal), Sodalite (alkaline igneous rocks), Aventurine (metamorphic, hydrothermal), Obsidian (volcanic flows), Quartz (ubiquitous in igneous, metamorphic, and sedimentary rocks).

Key Facts

Hardness

Variable, depending on the stone: Jasper (6.5-7 Mohs), Sodalite (5.5-6 Mohs), Aventurine (6.5-7 Mohs), Obsidian (5-5.5 Mohs), Quartz (7 Mohs).

Specific Gravity

Variable, depending on the stone: Jasper (2.58-2.91), Sodalite (2.13-2.29), Aventurine (2.64-2.69), Obsidian (2.35-2.60), Quartz (2.65).

Crystal System

Variable, depending on the stone: Jasper (Trigonal, microcrystalline), Sodalite (Isometric), Aventurine (Trigonal, microcrystalline), Obsidian (Amorphous), Quartz (Trigonal).

Color

Highly variable, encompassing the full spectrum of colors found in natural stones.

Luster

Variable, from dull to vitreous, sometimes greasy or glassy.

Transparency

Variable, from opaque (Jasper, Sodalite) to translucent (Aventurine, some Quartz) to transparent (clear Quartz) or opaque/translucent (Obsidian).

Fracture

Variable, depending on the stone: Jasper (conchoidal to splintery), Sodalite (uneven to conchoidal), Aventurine (conchoidal), Obsidian (conchoidal), Quartz (conchoidal).

Cleavage

Variable, depending on the stone: Jasper (none), Sodalite (poor to distinct), Aventurine (none), Obsidian (none), Quartz (none).

Composition

Variable, depending on the stone: Jasper (SiO2 with various impurities), Sodalite (Na8(Al6Si6O24)Cl2), Aventurine (SiO2 with fuchsite or hematite inclusions), Obsidian (primarily SiO2, amorphous), Quartz (SiO2).

Physical characteristics

• Crystal Habit: The external form is an artificial skull. The internal habit is characteristic of the raw material (e.g., massive, microcrystalline, amorphous).
• Cleavage Type: Variable, depending on the stone. Many common carving stones like Quartz, Jasper, and Obsidian lack cleavage. Sodalite exhibits poor to distinct dodecahedral cleavage.
• Fracture Type: Variable, typically conchoidal for most of the listed stones (Quartz, Obsidian, Aventurine, Sodalite), sometimes splintery for Jasper.
• Tenacity: Variable, generally brittle for most of the listed stones.
• Luster Type: Variable, commonly vitreous (glassy), sometimes dull, greasy, or waxy.

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