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Amir C. Akhavan's Photo Gallery

URN-4CCQuartz SiO2

01375160015561335834965.jpg
Bedretto Valley, Leventina, Ticino, Switzerland

Dimensions: 70 mm x 50 mm

Splitting growth led to the formation of a milky layer of small daughter crystals on the prism of older clear rock crystals. In allusion to sprouts on a twig Rykart calls such crystals "sprouting quartz" ("Sprossenquarz" in the original German, Rykart, 1995).

I don't know why, but some people call such specimens "artichoke quartz", although that is a bit of a misnomer. Artichoke quartz forms when splitting growth takes place over extended periods during crystal growth and unlike the crystals shown here the result actually does resemble artichokes.

The crystals are accompanied by small slender crystals and some very small needle quartz crystals in between that are not visible on the photo. Probably the elongated rock crystals and the small daughter crystals grew simultaneuosly and very fast.
Such specimens can be found in large veins along brecciated zones in the Upper Val Bedretto and the Nufenen pass area, they do not occur in alpine-type fissures.

The exact locality of the specimen is not known, similar specimens have been found at the Da Paccio quarry and elsewhere in the valley.

Width of the specimen 70mm.
Copyright: © Amir Akhavan      Photo ID: 951715     Uploaded by: Amir C. Akhavan   View Count: 52   Approval status: Public galleries    Type: Photo - 7392 x 5152 pixels (38.1 Mpix)

Southeastern Binntal

Multiple photos available
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Binn Valley, Valais, Switzerland

View of the mountains and mineral localities in the southeastern part of the Binntal. The spelling is that of the official Swiss topographical map, but the spelling of a lot of these localities varies in different publications, for example, Chollergrabe - Kollergraben, Mässerbach - Messerbach, Chriegalptal - Kriegalptal, etc. etc.
Thanks to Günter Frenz for correcting errors.

The photo has been taken from a nameless peak west of the Holzjihorn, above the Fäldbachtal.
August 2018.
Copyright: © Amir Akhavan      Photo ID: 908087     Uploaded by: Amir C. Akhavan   View Count: 262   Approval status: Public galleries    Type: Photo - 5480 x 3656 pixels (20.0 Mpix)

Aerial view of Oberalpstock, Upper Val Mila and Etzli

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Tujetsch, Surselva Region, Grisons, Switzerland

Aerial view of Oberalpstock and surrounding valleys, from above Piz Nair.
The lower left corner shows the eastern part of Hinteretzli, upper Etzlital, a southern branch of the Maderanertal, belonging tro Uri.
The lower right corner shows upper Val Mila and parts of Caschlè. Behind it is Val Strem with the Oberalpstock.
The wide valley in the upper right corner is the valley of the Vorderrhein / Rein Anteriur (Anterior Rhine).
August 2018.
Copyright: © Amir Akhavan      Photo ID: 907500     Uploaded by: Amir C. Akhavan   View Count: 115   Approval status: Public galleries    Type: Photo - 2720 x 1532 pixels (4.2 Mpix)

Val Maighels and Val Curnera

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Tujetsch, Surselva Region, Grisons, Switzerland

Annotated aerial photo of Val Curnera and Val Maighels, seen from above Crispalt.
Late afternoon shot, viewing south.

August 2018.
Copyright: © Amir Akhavan      Photo ID: 907479     Uploaded by: Amir C. Akhavan   View Count: 114   Approval status: Public galleries    Type: Photo - 2724 x 1532 pixels (4.2 Mpix)

Aerial view of upper Val Giuv

07895640015358851384359.jpg
Giuv Valley, Tujetsch, Surselva Region, Grisons, Switzerland

Late afternoon aerial view of upper Val Giuv, viewing southwest.

The names are either in Rhaeto-Romance or German language.

Emprema Muotta = 1. Muotta
Secunda Muotta = 2. Muotta
Tiarza Muotta = 3. Muotta

Muotta is also spelled "Motta" or "Muota", the spelling "Muotta" was taken from Swiss topographical maps.
"Muotta Dadens" is also spelled "Muotta Dadains".

"Fuorcla da Crispalt" is "Crispaltlücke" in German.

The Giuvstöckli (plural) are a bit confusing, as they are counted from the north, and as three of them are called Crispalttürme (plural). In some literature, only the first peak north of the Fuorcla da Crispalt is the Crispaltturm.

August 2018.


Mindat.org Photo of the Day - 22nd Oct 2018
Copyright: © Amir Akhavan      Photo ID: 907436     Uploaded by: Amir C. Akhavan   View Count: 707   Approval status: Public galleries    Type: Photo - 2720 x 1532 pixels (4.2 Mpix)

Aerial view of upper Val Giuv

06939350015357615935846.jpg
Giuv Valley, Tujetsch, Surselva Region, Grisons, Switzerland

Late afternoon aerial view of upper Val Giuv, viewing north.

Emprema Muotta = 1. Muotta
Secunda Muotta = 2. Muotta
Tiarza Muotta = 3. Muotta

Muotta is also spelled "Motta" or "Muota", the spelling "Muotta" was taken from Swiss topographical maps.
"Muotta Dadens" is also spelled "Muotta Dadains".

August 2018.
Compared to the photo https://www.mindat.org/photo-458007.html taken in August 2009, the Giuv glacier has shrunk considerably.

Copyright: © Amir Akhavan      Photo ID: 907266     Uploaded by: Amir C. Akhavan   View Count: 190   Approval status: Public galleries    Type: Photo - 2720 x 1532 pixels (4.2 Mpix)

Cima della Bianca

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Cima della Bianca north slope, Casatscha Valley, Cristallina Valley, Val Medel, Medel, Surselva Region, Grisons, Switzerland

Cima della Bianca (2893m), seen from Piz Vallatscha. The mountain lies at the eastern side of the Val Casatscha and marks the southern end of Val Cristallina. Like the Scopi group (Piz Vallatscha, Piz Miez, Scopi) west of it, the mountain is conspiciously divided into a northern part made of gneisses and a southern part made of weakly metamorphosed black slates. The gneiss contains the interesting alpine-type fissure mineralizations, in particular close to the peak, while the slate is rather poor in minerals. Both rock types are much older than the Alps and have undergone the same tectonic forces during alpine orogeny, and consequently both show roughly vertical joints.

August 2018.
Copyright: © Amir Akhavan      Photo ID: 905962     Uploaded by: Amir C. Akhavan   View Count: 101   Approval status: Public galleries    Type: Photo - 5480 x 3656 pixels (20.0 Mpix)

Fäldbachtal / Feldbachtal

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Fäldbach valley, Binn, Goms, Valais, Switzerland

The Fäldbachtal (Feldbachtal) is a high valley running parallel to the valley of the Binn river, following the general bedding of the rocks. The underlying rocks are mostly made of relatively soft calcite-rich mica schists (Bündnerschiefer) and glaciation led to a rounded surface morphology.
The valley floor is at 2000-2400m, the rounded mountain ridge that separates the valley from the Binn valley is only between 2400 and 2600m high. On this ridge there are long outcrops of dolomite strata containing magnetite that was once mined for iron. The rounded peak to the right is the Holzerspitz (2658m).
The mountain ridge to the north (left on the photo) is about 200m higher and is entirely made of Bündnerschiefer. The valley's end to the east are marked by the Turbechepf (four peaks of 2807, 2971, 3007 and 3118m) and the Holzjihorn (2987m) to the left.

There are several zones with alpine-type fissures. These extensional fissures cut the rock perpendicular to its layering and may contain rock crystals of "Tessin" habit (locally called "Binntal" habit). The valley is also famous for twinned rutile specimens, so-called "Knierutil" ("knee rutile") as well as circular rutile twins.

View towards east-north-east.
August 2018.
Copyright: © Amir Akhavan      Photo ID: 903326     Uploaded by: Amir C. Akhavan   View Count: 167   Approval status: Public galleries    Type: Photo - 3036 x 2024 pixels (6.1 Mpix)

Rhombic Dipyramid - Symmetry Class mmm

Rhombic Dipyramid - Symmetry Class mmm.

Pov Ray rendering.
Copyright: © Amir Akhavan      Photo ID: 881196     Uploaded by: Amir C. Akhavan   View Count: 96   Approval status: User gallery only    Type: Video - 0 min 7 sec - 1080 x 1080 pixels (1.2 Mpix)

Jurassic Navajo Sandstones at Kolob Canyons

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Zion National Park, Utah, USA

Lower to Mid Jurassic sandstones of the Navajo Formation form the cliffs at Kolob Canyons in the north-western part of Zion National Park. The cliffs are several hundred meters high and consist of an almost pure quartz sandstone that formed by lithification of desert sand dunes.
April 2008.
Copyright: © Amir Akhavan      Photo ID: 866036     Uploaded by: Amir C. Akhavan   View Count: 63   Approval status: Public galleries    Type: Photo - 3039 x 2014 pixels (6.1 Mpix)
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