Hellmann R, Penisson JM, Hervig RL, Thomassin JH, Abrioux MF (2003) An EFTEM/HRTEM high-resolution study of the near surface of labradorite
feldspar altered at acid pH: evidence for interfacial dissolution-reprecipitation.
Name 1 Carbuncle 2 K feldspar 3 Albite 4 Tektite 5 Magnetite 6 Demantoid 7 Oolitic hematite 8 Pink pyroxene 9 Idocrase 10 Black hematite 11 Biotite 12 Hornblende 13 Calcite 14 Labradorite
15 Magnesite 16 Rhodonite 17 Reniform hematite 18 Banded siliceous rocks 19 Diopside 20 Selenite 21 Alabaster 22 Anhydrite 23 Moonstone 24 Barite 25 Hypersthene Table 2: Emission lines for classification based on major elements from geological samples.
Because of the anorthite content (An 61%), this plagioclase is classified as Labradorite
. All spectra show an oxygen peak at approximately 0.3 KeV (Figs.
The sales center, at 303 Bond Street, features several large-scale art pieces made from the materials that Baltic will be constructed with, including marble, granite, quartz, labradorite
, and walnut and oak.
The matrix has a poikiloophitic texture formed predominantly by plagioclase (labradorite
, [An.sub.60-65], in some grains bytownite, [An.sub.70-75]) enclosed by elongated hypidiomorphic brownish augite crystals of 0.3-0.8 mm length and isometric grains of subordinated olivine and biotite; accessory phases are apatite and magnetite.
Intaglio talisman necklace, $360; Bangles with semi precious stones, $602 each; Yellow sterling silver pearl necklace wtih labradorite
beads and round zircons, $259
Harlow moonstone, labradorite
and smokey |quartz earrings, PS190 from featherandstone.com
Debbie has used unusual stones for this collection including labradorite
and golden rutilated quartz, which creates a strong, feminine look which suits a multitude of styles.
Plagioclase phenocrysts (bytownite or labradorite
; [An.sub.64-72]) have rims that are both similar to, and more sodic than, the calcic cores, with some solid solution variation within the cluster.
Thomas creates lamp finials out of slivers of malachite, howlite and agate, as well as unusual specimens like inky iridescent labradorite
, creamy blue-tinged chrysophase and petrified wood.
On the other hand, feldspar from the central facies is classified as plagioclase, with compositions ranging from labradorite
to anorthoclase ([An.sub.64-14] [Ab.sub.34-73] [Or.sub.01-12]; Table 1; Fig.
Plagioclases in trachyandesites are characterized by andesine to labradorite
composition (37 to 65% An, Table 1).