Strawberry Garnet Identification Guide
Identifying strawberry garnet, a marketing name for red garnet, by its glassy red dodecahedra, high hardness, lack of cleavage, and density.
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What Strawberry Garnet Looks Like
Strawberry garnet is a trade/marketing name for red garnet, most often almandine or pyrope (or pyrope-almandine blends), with a strawberry-red to slightly purplish or brownish-red color. It shows a glassy (vitreous) luster, transparency to translucency, and commonly grows as well-formed isometric crystals, especially the 12-sided dodecahedron or 24-faced trapezohedron, with no cleavage. In rock, it appears as rounded red grains or embedded crystals.
Step-by-Step Field ID
- Look at crystal shape. Equant, rounded, many-faced isometric crystals (dodecahedra) are a strong garnet clue.
- Check color and clarity. Even strawberry-red, glassy, often gemmy.
- Test hardness. Scratches glass readily (Mohs 7-7.5).
- Look for absence of cleavage. Garnet breaks with conchoidal to uneven fracture, no flat cleavage planes.
- Heft it. Dense for its size (SG ~3.6-4.3 depending on species).
Key Diagnostic Tests
- Mohs hardness: 7-7.5, scratches glass.
- Streak: white.
- Cleavage: none; conchoidal to uneven fracture.
- Specific gravity: ~3.8-4.3 (almandine highest), notably heavy.
- Single refraction: garnet is isotropic, so no doubling of facets when viewed through it.
Common Look-Alikes
- Ruby/red spinel: harder (corundum Mohs 9) or similar (spinel 8) and usually as different crystal forms (spinel octahedra); both can resemble red garnet but garnet's dodecahedral habit and lower hardness separate it.
- Red tourmaline (rubellite): forms striated three-sided prisms, is harder along the prism, and shows strong pleochroism (color shift with viewing angle); garnet shows none.
- Glass imitations: softer (will not scratch glass), may show bubbles and a fixed look.
- Other garnet trade names (rhodolite, etc.): "strawberry garnet" is not a distinct species; gemological testing (SG, refractive index) identifies the actual garnet species.
Where It Is Found
Red garnet is widespread in metamorphic rocks (mica schist, gneiss, eclogite) and some igneous rocks and placers. Sources marketed as strawberry garnet include Tanzania, Mozambique, Madagascar, India, Brazil, and the United States.
Frequently asked questions
Is strawberry garnet a real type of garnet?
Strawberry garnet is a marketing name rather than a distinct species; it is typically red almandine, pyrope, or a pyrope-almandine mix sold for its strawberry-red color.
How can you tell if it is real strawberry garnet?
Confirm a glassy red stone that scratches glass (Mohs 7-7.5), shows no cleavage, is dense (SG ~3.8-4.3), is single-refractive, and often forms 12-sided dodecahedral crystals.
Strawberry garnet vs ruby: how do they differ?
Ruby is corundum and much harder (Mohs 9) and denser, often showing pleochroism; garnet is softer (7-7.5), isotropic, and commonly forms dodecahedra.
What gives strawberry garnet its red color?
Iron (in almandine) and magnesium-iron chemistry (in pyrope) produce the red color; chromium can add to the saturation in some pyropes.