Urstad feldspar quarry, Hidra (Hitterø), Flekkefjord, Vest-Agder, Norway

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(Urstad feltspatbrudd, Hidra, Flekkefjord kommune, Vest-Agder fylke, Norge)

A old feldspar quarry in granite pegmatite. Especially noted for large Aeschynite-(Y) crystals (> 3 kg). Chunks of aeschynite-(Y)up to 20 kg has been found here.

References:
- Brøgger, W.C. (1879): Untersuchungen norwegischer Mineralien I. Zeitschrift für Krystallographie und Mineralogie 3, 471-487 (+ plates XI-XIII)[first crystallographic description on aeschynite-(Y) from Urstad]
- Brøgger, W.C. (1906): Die Mineralien der Südnorwegischen Granitpegmatitgänge, I. Niobate, tantalate, titanate und titanoniobate. Videnskapsselskapets Skrifter. I.Mat-Naturv. Klasse 1906, 6.[p.97-104- first description of blomstrandine = Aeschynite -(Y)]

Mineral List:

Aeschynite-(Y) (TL)

(Y,Ca,Fe,Th)(Ti,Nb)

(O,OH)

Type Locality:	Urstad feldspar quarry, Hidra (Hitterø), Flekkefjord, Vest-Agder, Norway
Habit:	Platy after {010}, with the dominant form {010}, {130}, {001}. Forms also observed: {110}, {120}, {111}, {101}, [001}
Colour:	Brownish black, metamict with thin brownish alteration
Description:	Brøgger (1879) gave a crystallographic description of a black mineral from Urstad without chemical analysis. He thought it to be identical with aeschynite (From Miask, which later was named aeschynite-(Ce)). In Brøgger (1906) the mineral were described in detail, and given the name Blomstrandine. He states on p. 104 the that aeschynite from Miask is a Cerium-Aeschynit and that the blomstrandine from Hitterö was a "Yttrium-Aeschynit". A part of a crystal weighing 3kg and chunks up to 20 kg has been noted.
Reference:	[Brøgger, W.C. (1879): Untersuchungen norwegischer Mineralien I. Zeitschrift für Krystallographie und Mineralogie 3, 471-487 (+ plates XI-XIII); Brøgger, W.C. (1906): Die Mineralien der Südnorwegischen Granitpegmatitgänge, I. Niobate, tantalate, titanate und titanoniobate. Videnskapsselskapets Skrifter. I.Mat-Naturv. Klasse 1906, 6: 97- 104; Adamson (1942); Clark (1993 - "Hey's Mineral Index, 3rd Edition")]

'Allanite'

Description:	Described by Schetelig (1922) as orthit
Reference:	[Schetelig, J. (1922): Orthit. in Brøgger, W.C, Vogt, Th. & Schetelig, J. (1922): Die Mineralien der südnorwegischen Granitpegmatitgänge. II. Silikate der seltenen Erde. Videnskapsselskapets Skrifter. I.Mat-Naturv. Klasse 1922. 11, p. 128-138]

'Feldspar Group'

Reference:

[Brøgger, W.C. (1906): Die Mineralien der Südnorwegischen Granitpegmatitgänge, I. Niobate, tantalate, titanate und titanoniobate. Videnskapsselskapets Skrifter. I.Mat-Naturv. Klasse 1906, 6: 97- 104]

Gadolinite-(Y)

[O|SiO

]

Reference:

[Schetelig, J. (1922): Gadolinit. in Brøgger, W.C, Vogt, Th. & Schetelig, J. (1922): Die Mineralien der südnorwegischen Granitpegmatitgänge. II. Silikate der seltenen Erde. Videnskapsselskapets Skrifter. I.Mat-Naturv. Klasse 1922. 11, 88-123 [p.89]

4 entries listed. 2 valid minerals. 1 type locality (valid mineral).

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