2.19ct AAA Translucent Gel Sugilite Cabochon Gemstone Top Gel Sugilith Edelstein
Translucent Gel Sugilite Cabochon - Wessels Mine - South Africa
Cut from rough stone purchased in the late 90's - today very rare
Pictures taken in daylight - some Sugilite tends to seem more blue in pictures then in reality
Size : 9 x 6.8 x 3.3 mm Weight : 2.19 ct
Sugilite
| Sugilite from Wessels Mine in Northern Cape Province , South Africa | |
| General | |
| Category | Cyclosilicate |
| Formula (repeating unit) | K Na 2(Fe ,Mn ,Al )2Li 3Si 12O 30 |
| Strunz classification | 09.CM.05 |
| Dana classification | 63.02.01a.09 |
| Crystal symmetry | Hexagonal |
| Identification | |
| Formula mass | 1,041.66 |
| Color | Light brownish-yellow, purple, violet, reddish violet, pale pink, colourless |
| Crystal habit | Granular |
| Mohs scale hardness | 6–6½ |
| Luster | Vitreous |
| Streak | White |
| Diaphaneity | Transparent to translucent |
| Specific gravity | 2.74 |
| References | [ 1] [ 2] |
Sugilite (also known as lavulite ) is a relatively rare pink to purple cyclosilicate mineral with the complex chemical formula K Na 2(Fe ,Mn ,Al )2Li 3Si 12O 30. Sugilite crystallizes in the hexagonal system with prismatic crystals. The crystals are rarely found and the form is usually massive. It has a Mohs hardness of 5.5 to 6.5 and a specific gravity of 2.75 to 2.80. It is mostly translucent.
Sugilite was first described in 1944 by the Japanese petrologist Ken-ichi Sugi (1901–1948) for an occurrence on Iwagi Islet, Japan , where it is found in an aegirine syenite intrusive stock. It is found in a similar environment at Mont Saint-Hilaire , Quebec , Canada . In the Wessels mine in Northern Cape Province of South Africa , sugilite is mined from a strata-bound manganese deposit. It is also reported from Liguria and Tuscany , Italy ; New South Wales , Australia and Madhya Pradesh , India .
Note: The mineral is commonly pronounced with a soft "g", as in "ginger". However, as with most minerals, its pronunciation is intended to be the same as the person it is named after; in this case, the Japanese name Sugi has a hard "g", as in "geese": / ˈ s uː ɡ ɨ l aɪ t / SOO -gi-lyt .
Contents [hide ] - 1 Gallery
- 2 See also
- 3 References
- 4 External links
Gallery [ edit ] -
A rich thumber of pretty purple sugilite on a matrix of bladed barite crystals, Wessels Mine in Northern Cape Province , South Africa , size: 2.4 x 2.1 x 1.2 cm.
See also [ edit ]
A rich thumber of pretty purple sugilite on a matrix of bladed barite crystals, Wessels Mine in Northern Cape Province , South Africa , size: 2.4 x 2.1 x 1.2 cm.
| Earth sciences portal |
- Classification of minerals
- List of minerals
- List of minerals named after people
References [ edit ] - Jump up ^ Webmineral
- Jump up ^ Mindat.org
External links [ edit ]
| Wikimedia Commons has media related to Sugilite . |
- R. V. Dietrich
- Mineral galleries
- MSA Handbook PDF
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- Potassium minerals
- Sodium minerals
- Iron minerals
- Manganese minerals
- Aluminium minerals
- Lithium minerals
- Cyclosilicates
- Gemstones
- Hexagonal minerals
- Condition: Nuovo: altro (vedi dettagli)
- Condition: Examination of jewelry-quality sugilite shows that it consists of manganese-bearing sugilite and other minerals in a polycrystalline aggregate. The material occurs in a large stratiform manganese orebody at the Wessels mine near Kuruman, South Africa. Some 12 to 15 tons of sugilite of varying quality are estimated to occur at the mine. The attractive purple color is due to the presence of about 1-3 wt. % manganese oxide. The research reported here revealed that there are actually two types of gem materials that have heretofore been called sugilite: one that is predominantly manganoan sugilite with minor impurity minerals, and the other that is chalcedony mixed with (and colored by) sugilite.
- Stein: Sugilite
- Farbe: Purple
- Reinheit: Gel - Translucent
- Gewicht: 2.19 ct
- Modell: Gel Quality Sugilite
- Schliff: Cabochon
- Herstellernummer: Classic Rocks and Gems
- Gel Sugilite Gemstone Wessels: Gel Sugilith Edelstein Südafrika
PicClick Insights - 2.19ct AAA Translucent Gel Sugilite Cabochon Gemstone Top Gel Sugilith Edelstein PicClick Esclusivo
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