Turritella Agate
| Refractive Index : 1.54 – 1.53 |
| Optical Characteristic : AGG |
| Specific Gravity : 2.60 + 0.30 – 0.05 |
| Formula : SiO2 |
| Crystal System : Trigonal |
| Variety/Species : Chalcedony |
| Species/Group : Cryptocrystaline Quartz |
| Birefringence : 0.004 |
| Dispersion : None |
| Hardness : 6.5 to 7 |
| Toughness : Good |
| Ultrasonic : Uaually safe |
| Steam : Usually safe |
| UV Long : Inert to moderate |
| UV Short : Inert to moderate |
| Pleochroism : None |
| Strength : N/A |
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| Pleochroism Colors : None |
| Heat : May change color |
| Acids : Acids may attack dyes |
| Light : Stable |
| Polish Luster : Greasy to vitreous |
| Fracture : Conchoidal, may be granular |
| Fracture Luster : Dull to vitreous |
| Clarity Type : N/A |
| Tones : N/A |
| Saturations : N/A |
| Cause of Color : Iron |
| Enhancements : None |
| Cleavage : None or indistinct |
| Color Range : Brown, gray, black, with small spiral shells, brownish, grayish, blackish |
| Transparency : opaque |
| Phenomena : None |
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| Separations : Turritella Agate from- Glass : magnification, fracture luster, RI, SG, fracture, (all possibly) |
| Identifying Characteristics and information Dark brown body color with small spiral shells. The fossil shells aren’t actually in the Turritella family. They are Oxyterma genera fossils |
| Spectral Data Not diagnostic |
| Trade Names and Misnomers Shell Agate Turrite Agate |
Tags: Chalcedony, Cryptocrystaline Quartz, Shell Agate
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