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Sphene, 0.78ct, sparkling in all colours that gem brings happiness!
- 存貨單位
- 尺寸(毫米)
- 6.700 x 5.000 x 3.300mm
- 重量 (cts)
- 0.780
- Treatment
- No Treatment
- Clarity
- SI
- 類型
- Faceted
- 顏色
-
Titanite, or sphene (from the Greek sphenos (σφηνώ), meaning wedge), is a calcium titanium nesosilicate mineral, CaTiSiO5. Trace impurities of iron and aluminium are typically present. Also commonly present are rare earth metals including cerium and yttrium; calcium may be partly replaced by thorium.
The International Mineralogical Association Commission on New Minerals and Mineral Names (CNMMN) adopted the name titanite and "discredited" the name sphene as of 1982, although commonly papers and books initially identify the mineral using both names. Sphene was the most commonly used name until the IMA decision, although both were well known. Some authoritiesthink it is less confusing as the word is used to describe any chemical or crystal with oxidized titanium such as the rare earth titanate pyrochlores series[11] and many of the minerals with the perovskite structure. The name sphene continues to be publishable in peer-reviewed scientific literature, e.g. a paper by Hayden et al. was published in early 2008 in the journal Contributions to Mineralogy and Petrology. Sphene persists as the informal name for titanite gemstones.
Titanite, which is named for its titanium content, occurs as translucent to transparent, reddish brown, gray, yellow, green, or red monoclinic crystals. These crystals are typically sphenoid in habit and are often twinned. Possessing a subadamantine tending to slightly resinous luster, titanite has a hardness of 5.5 and a weak cleavage. Its specific gravity varies between 3.52 and 3.54. Titanite's refractive index is 1.885–1.990 to 1.915–2.050 with a strong birefringence of 0.105 to 0.135 (biaxial positive); under the microscope this leads to a distinctive high relief which combined with the common yellow-brown colour and lozenge-shape cross-section makes the mineral easy to identify. Transparent specimens are noted for their strong trichroism, the three colours presented being dependent on body colour. Owing to the quenching effect of iron, sphene exhibits no fluorescence under ultraviolet light. Some titanite has been found to be metamict, in consequence of structural damage due to radioactive decomposition of the often significant thorium content. When viewed in thin section with a petrographic microscope, pleochroic halos can be observed in minerals surrounding a titanite crystal.
Titanite occurs as a common accessory mineral in intermediate and felsic igneous rocks and associated pegmatites. It also occurs in metamorphic rocks such as gneiss and schists and skarns. Source localities include: Pakistan; Italy; Russia; China; Brazil; Tujetsch, St. Gothard, Switzerland; Madagascar; Tyrol, Austria; Renfrew County, Ontario, Canada; Sanford, Maine, Gouverneur, Diana, Rossie, Fine, Pitcairn, Brewster, New York and California in the US.
Titanite is a source of titanium dioxide, TiO2, used in pigments.
As a gemstone, titanite is usually some shade of chartreuse, but can be brown or black. Hue depends on Fe content, with low Fe content causing green and yellow colours, and high Fe content causing brown or black hues. Zoning is typical in titanite. It is prized for its exceptional dispersive power (0.051, B to G interval) which exceeds that of diamond. Jewelry use of titanite is limited, both because the stone is uncommon in gem quality and is relatively soft.
Titanite can also be used as a U-Pb geochronometer, specifically in metamorphic terranes.
Shipping: For special requests such as express delivery please contact me. For lost stones the seller is not liable, therefore an additional insurance is recommended. Right of return within two weeks after receiving the shipment. Payment via PayPal, Credit Card, or Bank transfer is possible. For the shipping I generally use: Austrian Post or FedEx. Unfortunately from Austria only DHL "express" is possible. Please pay your stones in between five days or contact me. Otherwise I need to cancel the deal.
If there is anything you aren´t satisfied with, please just let me now and we will find a way to solve every problem. My aim is to make you happy with beautiful stones of good quality, good communication is the easiest way to understand the others´ needs.
- 存貨單位
- 尺寸(毫米)
- 6.700 x 5.000 x 3.300 mm
- 重量 (cts)
- 0.780
- Treatment
- No Treatment
- Clarity
- SI
- 類型
- Faceted
- 顏色
-
Titanite, or sphene (from the Greek sphenos (σφηνώ), meaning wedge), is a calcium titanium nesosilicate mineral, CaTiSiO5. Trace impurities of iron and aluminium are typically present. Also commonly present are rare earth metals including cerium and yttrium; calcium may be partly replaced by thorium.
The International Mineralogical Association Commission on New Minerals and Mineral Names (CNMMN) adopted the name titanite and "discredited" the name sphene as of 1982, although commonly papers and books initially identify the mineral using both names. Sphene was the most commonly used name until the IMA decision, although both were well known. Some authoritiesthink it is less confusing as the word is used to describe any chemical or crystal with oxidized titanium such as the rare earth titanate pyrochlores series[11] and many of the minerals with the perovskite structure. The name sphene continues to be publishable in peer-reviewed scientific literature, e.g. a paper by Hayden et al. was published in early 2008 in the journal Contributions to Mineralogy and Petrology. Sphene persists as the informal name for titanite gemstones.
Titanite, which is named for its titanium content, occurs as translucent to transparent, reddish brown, gray, yellow, green, or red monoclinic crystals. These crystals are typically sphenoid in habit and are often twinned. Possessing a subadamantine tending to slightly resinous luster, titanite has a hardness of 5.5 and a weak cleavage. Its specific gravity varies between 3.52 and 3.54. Titanite's refractive index is 1.885–1.990 to 1.915–2.050 with a strong birefringence of 0.105 to 0.135 (biaxial positive); under the microscope this leads to a distinctive high relief which combined with the common yellow-brown colour and lozenge-shape cross-section makes the mineral easy to identify. Transparent specimens are noted for their strong trichroism, the three colours presented being dependent on body colour. Owing to the quenching effect of iron, sphene exhibits no fluorescence under ultraviolet light. Some titanite has been found to be metamict, in consequence of structural damage due to radioactive decomposition of the often significant thorium content. When viewed in thin section with a petrographic microscope, pleochroic halos can be observed in minerals surrounding a titanite crystal.
Titanite occurs as a common accessory mineral in intermediate and felsic igneous rocks and associated pegmatites. It also occurs in metamorphic rocks such as gneiss and schists and skarns. Source localities include: Pakistan; Italy; Russia; China; Brazil; Tujetsch, St. Gothard, Switzerland; Madagascar; Tyrol, Austria; Renfrew County, Ontario, Canada; Sanford, Maine, Gouverneur, Diana, Rossie, Fine, Pitcairn, Brewster, New York and California in the US.
Titanite is a source of titanium dioxide, TiO2, used in pigments.
As a gemstone, titanite is usually some shade of chartreuse, but can be brown or black. Hue depends on Fe content, with low Fe content causing green and yellow colours, and high Fe content causing brown or black hues. Zoning is typical in titanite. It is prized for its exceptional dispersive power (0.051, B to G interval) which exceeds that of diamond. Jewelry use of titanite is limited, both because the stone is uncommon in gem quality and is relatively soft.
Titanite can also be used as a U-Pb geochronometer, specifically in metamorphic terranes.
Shipping: For special requests such as express delivery please contact me. For lost stones the seller is not liable, therefore an additional insurance is recommended. Right of return within two weeks after receiving the shipment. Payment via PayPal, Credit Card, or Bank transfer is possible. For the shipping I generally use: Austrian Post or FedEx. Unfortunately from Austria only DHL "express" is possible. Please pay your stones in between five days or contact me. Otherwise I need to cancel the deal.
If there is anything you aren´t satisfied with, please just let me now and we will find a way to solve every problem. My aim is to make you happy with beautiful stones of good quality, good communication is the easiest way to understand the others´ needs.
運輸商 | 運送至:國家 | 運送到世界其他地區 |
---|---|---|
Standard Shipping - Tracked | $12.00 / :幾天天 | $16.00 / :幾天天 |
:國家
Standard Shipping - Tracked 對包含 3 或更多商品的訂單折扣為 $15.00
世界其他地區
Standard Shipping - Tracked 對包含 3 或更多商品的訂單折扣為 $17.00
|
||
FedEx | $27.00 / :幾天天 | $46.00 / :幾天天 |
:國家
FedEx 對包含 2 或更多商品的訂單折扣為 $26.00
世界其他地區
FedEx 對包含 2 或更多商品的訂單折扣為 $45.00
|
||
Express Shipping | $36.00 / :幾天天 | $75.00 / :幾天天 |
:國家
Express Shipping 對包含 3 或更多商品的訂單折扣為 $40.00
世界其他地區
Express Shipping 對包含 3 或更多商品的訂單折扣為 $65.00
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||
Registered Shipping | $9.00 / :幾天天 | $16.00 / :幾天天 |
:國家
Registered Shipping 對包含 3 或更多商品的訂單折扣為 $15.00
世界其他地區
Registered Shipping 對包含 3 或更多商品的訂單折扣為 $15.00
|
||
Standard Shipping - Untracked | $5.00 / :幾天天 | $13.00 / :幾天天 |
:國家
Standard Shipping - Untracked 對包含 3 或更多商品的訂單折扣為 $15.00
世界其他地區
Standard Shipping - Untracked 對包含 3 或更多商品的訂單折扣為 $13.00
|
![stonehengejpd](https://liveplatforms-production.b-cdn.net/tenants/gr/uploads/sellers/215146/aa5cc8c9-93b2-4a02-ba1b-828a8728181e.jpg)
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積極的
Arrived quickly well packaged. Beautiful gemstone. Good seller communication. Another Smooth Transaction. Thank you
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積極的
Really beautiful stone. I'm happy with my purchase.
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積極的
This one is special for sure going to make a treasured family heirloom! Never disappointed with your stones or service. Always a pleasure!
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積極的
Another beautiful stone that surpassed even my expectations ! Always a pleasure to do business with you!
為什麼用戶出價高於自己?
出價時,這是用戶願意為產品出價的最高金額。然後,我們的系統將代表該用戶自動出價,逐步提高出價以保持其作為最高出價者的地位,直至達到指定的最高價。
當出現“自動出價”圖標時,表示我們的系統正在根據用戶的最高出價主動為用戶出價。這可能看起來好像用戶出價高於自己,但這只是系統更新出價以反映用戶最高限額的結果。