Thortveitite - Wikipedia
Thortveitite is a rare mineral consisting of scandium yttrium silicate (Sc,Y) 2 Si 2 O 7. It is the primary source of scandium. [2] Occurrence is in granitic pegmatites. It was named after Olaus Thortveit, a Norwegian engineer. It is grayish-green, black or gray in color. [3] [4] [5] [6]
Thortveitite Mineral Data
Named after the Norwegian engineer, O. Thortveit. Comments: Small white prismatic crystals of thortveitite on matrix. Location: A4 highway tunnel, Thiemendorf, Königshain, Oberlausitz, Saxony, Germany. Scale: Picture size 1.7 mm. Brown, Grayish black, Black, Grayish green.
Thortveitite Group: Mineral information, data and localities.
A group of rare-earth disilicates with the general formula REE 2 Si 2 O 7; the closely related Ca-Zr-disilicate gittinsite is also included. Numerous synthetic compounds with the thortveitite structure or a closely related structure are known. Data courtesy of the American Mineralogist Crystal Structure Database.
Thortveitite and associated Sc-bearing minerals from Ravalli …
1993年1月1日 · Thortveitite is found as colorless and clear to smoky and translucent, subhedral to euhedral prisms up to 3 mm in length in the massive fluroite, as mm-sized anhedra to subhedra in diopside and edenite, and as ??m-sized droplet-like crystals in actinolite.
Thortveitite (Sc;Y)2Si2O7 °c 2001 Mineral Data Publishing, version 1.2 Crystal Data: Monoclinic. Point Group: 2=m: Crystals typically prismatic along [110], to 35cm. Twinning: Commonly twinned, axis ? f110g, composition plane f110g, rarely polysynthetically. Physical Properties: Cleavage: Prismatic. Fracture: Uneven to conchoidal. Tenacity ...
Thortveitite
Large, single thortveitite crystal at display in the collection of the L'Ecole de Mines in Paris, France. This specimen was collected by Theodor Gautestad and he exchanged it for unknown minerals with the museum.
Thortveitite Definition & Meaning - Merriam-Webster
The meaning of THORTVEITITE is a mineral (Sc,Y)2Si2O7 consisting of scandium yttrium silicate and occurring in slender grayish-green orthorhombic crystals (hardness 6—7, specific gravity 3.6).
Thortveitite mineral information and data - dakotamatrix.com
Slender greenish Thortveitite crystals to 7-8mm embedded throughout a piece of reddish Feldspar matrix. Thortveitite is a relatively rare REE Silicate that was discovered in Norway and named for Olaus Thortveit, a feldspar and mineral exporter.
(PDF) Thortveitite – a new gemstone | John Spratt - Academia.edu
The Journal of Gemmology / January – April 2008 / Volume 17 / No. 1 Thortveitite – a new gemstone R. Chapman, I.F. Mercer, A.H. Rankin and J. Spratt Abstract: A water-worn pebble of good clarity purchased in Bangkok started the quest that identified this as gem-quality thortveitite, a scandium yttrium silicate.
(PDF) Thortveitite – a new gemstone - ResearchGate
2008年1月1日 · The rare Sc mineral thortveitite, (Sc,Y)2Si2O7, occurs as μm- to mm-sized crystals in fluorite-bearing granitic pegmatites and the host melagabbro within the Crystal Mountain fluorite deposit ...