Thomsonite
| Refractive Index : 1.540 – 1.515 (+0.015 – 0.018) |
| Optical Characteristic : DR, B+ , AGG |
| Specific Gravity : 2.35 (+0.05 – 0.10) |
| Formula : NaCa2AI5Si5O20.6(H2O) |
| Crystal System : Orthorhombic |
| Variety/Species : Thomsonite |
| Species/Group : Zeolite Group |
| Birefringence : 0.021 |
| Dispersion : N/A |
| Hardness : 5 to 5.5 |
| Toughness : Fair |
| Ultrasonic : Never |
| Steam : Never |
| UV Long : Inert to moderate |
| UV Short : Inert |
| Pleochroism : None |
| Strength : N/A |
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| Pleochroism Colors : None |
| Heat : Avoid heating |
| Acids : Attacked by acids and/or chemicals |
| Light : stable |
| Polish Luster : vitreous to pearly |
| Fracture : Uneven |
| Fracture Luster : Dull to silky |
| Clarity Type : N/A |
| Tones : N/A |
| Saturations : N/A |
| Cause of Color : unknown |
| Enhancements : none |
| Cleavage : Perfect 1 direction. |
| Color Range : Brown, yellow, orange, gray struture and color patterns produce “eyes”. |
| Transparency : translucent to opaque |
| Phenomena : None |
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| Separations : Thomsonite from- Agate : Appearance, SG, fracture, RI Onyx marble calcite : SG, appearance, RI, (birefringence) Thulite : SG, appearance, RI (possibly) Unakite : SG, appearance, RI(possibly) |
| Identifying Characteristics and information Spot RI is approximately 1.53. Banded or mottled. Radiating circular aggregates produce “eyes”. May fluorescence patchy brown and white (LW) |
| Spectral Data not diagnostic. |
| Trade Names and Misnomers Bagotite Comptionite(M) Eye Stone Faroelite Gibsonite(S) Lake superior Agate(M) Lintonite(S) Ozarkite(S) Thomsonite |
Tags: Orthorhombic, Thomsonite, Zeolite Group
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