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Zeolites and other Icelandic minerals from Hvalfjörður
  
  Index -> Mines and Mineral Localities
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Bergur_E_Sigurdarson




Joined: 21 Dec 2017
Posts: 77
Location: Mosfellsbær, Iceland


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PostPosted: Oct 31, 2018 19:10    Post subject: Zeolites and other Icelandic minerals from Hvalfjörður  

Being a local, I have only a short drive from the capital area of Reykjavik to Hvalfjörður, and although I do look at several locations (just about wherever I see potential and am allowed to) I mainly collect at a site just by Hvaleyri, since the landowner there has given me permission to do so.

A part of me wants to take a drive and look and collect every time the weather is decent, but on the other hand I'm trying not to hoard excessively.... hehe... and of course failing a bit at that :-)

This fall I've been twice, and now it's getting about too cold to collect as the north-facing cliffs are icing up.

In this first post are just some phone-cam shots from the last trip... but shortly I will add images of some of the gathered pieces. (Already took a few pics, but yet to take measurements)

Most of what I find at Hvaleyri are Zeolites... so far I believe I have found Stilbite, Heulandite-Ca, Mesolite, Analcime, Calcite, Natrolite (?) and possibly a couple more.

Many of the vugs/cavities are lined with Celadonite or other coloured "clay"... and though most of the host rock is Basalt, it has been transformed quite a bit by the same low-temp thermal activity that allowed the minerals to crystallize (if I understand the local geology correctly). This same transformation means that the colours of the basalt vary quite a bit from the classic gray-blue, into orange-browns as well as reddish and even almost blue-green (but those are mostly just variations into those from a gray, so still dull). In part the transformation has caused the basalt to decay and fracture... yet it always seems harder than the Zeolites within.



IMG_20181026_155555561_HDR.jpg
 Locality:
Hvalfjörður, Capital Region, Iceland
 Description:
 Viewed:  1333 Time(s)

IMG_20181026_155555561_HDR.jpg



IMG_20181026_170150510_HDR.jpg
 Locality:
Hvalfjörður, Capital Region, Iceland
 Description:
 Viewed:  1340 Time(s)

IMG_20181026_170150510_HDR.jpg



IMG_20181026_134015505_HDR.jpg
 Locality:
Hvalfjörður, Capital Region, Iceland
 Description:
Cliffs icing up
 Viewed:  1336 Time(s)

IMG_20181026_134015505_HDR.jpg



IMG_20181026_131732006.jpg
 Locality:
Hvalfjörður, Capital Region, Iceland
 Description:
From under that came a few nice plates of white stilbite
 Viewed:  1340 Time(s)

IMG_20181026_131732006.jpg



IMG_20181026_131723672_HDR.jpg
 Locality:
Hvalfjörður, Capital Region, Iceland
 Description:
This cavity came out whole, but sadly turned out to be almost completely filled with Stilbite.
 Viewed:  1336 Time(s)

IMG_20181026_131723672_HDR.jpg



IMG_20181026_135536180.jpg
 Locality:
Hvalfjörður, Capital Region, Iceland
 Description:
Most likely Chabazite, this was on a boulder that I failed to remove a nice specimen from, but got some from the other parts.
 Viewed:  1341 Time(s)

IMG_20181026_135536180.jpg



IMG_20181026_144450672.jpg
 Locality:
Hvalfjörður, Capital Region, Iceland
 Description:
The remnants of the largest vug I've found at the locality. Came out incredibly clean as no outside dirt seemed to have managed to get in.
It was nearly all Stilbite, but very unusal for this area as it has parts that show very pretty pink hues!
What is in the picture still sits in the cliff wall as I didn't have tools to get any further in without smashing everything into pieces.
 Viewed:  1340 Time(s)

IMG_20181026_144450672.jpg


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James Catmur
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Joined: 14 Sep 2006
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Location: Cambridge


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PostPosted: Nov 01, 2018 02:51    Post subject: Re: Zeolites and other Icelandic minerals from Hvalfjörður  

We would love to see some specimen photos, so we can see the locality and what it produces.
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Chris Rayburn




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PostPosted: Nov 01, 2018 05:43    Post subject: Re: Zeolites and other Icelandic minerals from Hvalfjörður  

Thank you for sharing these, Bergur. As an avid field collector, I always appreciate seeing photos of collecting sites and in situ material to help bring the collecting experience to life, although I’m not always good about taking such photos myself in the “heat of the moment.”
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Bergur_E_Sigurdarson




Joined: 21 Dec 2017
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Location: Mosfellsbær, Iceland


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PostPosted: Nov 01, 2018 11:37    Post subject: Re: Zeolites and other Icelandic minerals from Hvalfjörður  

Some specimen photos.

Many of the minerals have questionmarks regarding ID, as I have only visual comparison and known locality info from Mindat, which is limited. The country is known for more than just the locality has verified and at a small scale I'm not expert enough to make sure.

In some of the images blues are a bit more saturated than I'd like, but the crystals aren't of that colour anyway in most cases, but rather reflecting a layer underneath them.



natro-calcite-on-heuland.jpg
 Mineral: Calcite, Heulandite-Ca, Natrolite (?) / Mesolite (?)
 Locality:
Hvalfjörður, Capital Region, Iceland
 Dimensions: 75x70x30mm
 Description:
Nice spray of Natrolite/Mesolite (possibly other, Scolecite or Mordenite ...hard to tell by visual ID alone) on a druzy of Heulandite-Ca and vug mostly filled with Calcite.
Spray is 19mm across and each XL about 12mm long
 Viewed:  1212 Time(s)

natro-calcite-on-heuland.jpg



natrolite.jpg
 Mineral: Natrolite (?) / Mesolite (?), Heulandite-Ca
 Locality:
Hvalfjörður, Capital Region, Iceland
 Dimensions: 29x48x26mm
 Description:
Sprays of Natrolite/Mesolite (18mm wide 14mm long) and very minor Heulandite druzy
 Viewed:  1212 Time(s)

natrolite.jpg



stilbite-heulandite.jpg
 Mineral: Stilbite, Heulandite-Ca
 Locality:
Hvalfjörður, Capital Region, Iceland
 Dimensions: 44x54x27mm
 Description:
Main Stilbite is 8mm long and 4mm wide. Heulandite probably in druzy, tho a bit unusual from what I most ly see there
 Viewed:  1208 Time(s)

stilbite-heulandite.jpg



chaba-heulandite.jpg
 Mineral: Chabazite, Heulandite-Ca
 Locality:
Hvalfjörður, Capital Region, Iceland
 Dimensions: 84xx63x43mm
 Description:
Nice Chabasite XLs (largest is 6x5x4mm) growing on typical Heulandite druzy
 Viewed:  1209 Time(s)

chaba-heulandite.jpg



chaba-analcime.jpg
 Mineral: Chabazite, Analcime, (Heulandite-Ca)
 Locality:
Hvalfjörður, Capital Region, Iceland
 Dimensions: 23x35x14mm
 Description:
Chabasite (largest XL is only 3mm) on Analcime and possible some Heulandite
 Viewed:  1209 Time(s)

chaba-analcime.jpg



analcime.jpg
 Mineral: Analcime
 Locality:
Hvalfjörður, Capital Region, Iceland
 Dimensions: 74x57x34mm
 Description:
Analcime, main vug photographed is 22x18mm and largest XL is about 2mm
 Viewed:  1209 Time(s)

analcime.jpg



mesolite.jpg
 Mineral: Mesolite (?), Analcime, Heulandite-Ca
 Locality:
Hvalfjörður, Capital Region, Iceland
 Dimensions: 46x38x12mm
 Description:
Balls of most likely Mesolite (each ball is up to 6mm across) on Analcime and Heulandite (some of that is more visible on backside)
 Viewed:  1211 Time(s)

mesolite.jpg



mesolite-on-analcime.jpg
 Mineral: Mesolite (?), Analcime
 Locality:
Hvalfjörður, Capital Region, Iceland
 Dimensions: 78x73x50mm
 Description:
Largest speres are about 8mm
 Viewed:  1209 Time(s)

mesolite-on-analcime.jpg



natrolite-stilbite.jpg
 Mineral: Natrolite (?), Stilbite
 Locality:
Hvalfjörður, Capital Region, Iceland
 Dimensions: 63x38x34mm
 Description:
Stilbite is up to 12mm long and the sprays of Natrolite (?) stand up to 5mm further out into the vug
 Viewed:  1207 Time(s)

natrolite-stilbite.jpg



natrolite-stilbite2.jpg
 Mineral: Stilbite, Natrolite (?)
 Locality:
Hvalfjörður, Capital Region, Iceland
 Dimensions: 82x70x36mm
 Description:
Stilbite up to 10mm with Natrolite (?) on top up to 6mm... also seperate sprays of up to 10mm
 Viewed:  1211 Time(s)

natrolite-stilbite2.jpg



natrolite-stilbite3.jpg
 Mineral: Stilbite, Natrolite (?)
 Locality:
Hvalfjörður, Capital Region, Iceland
 Dimensions: 50x46x28mm
 Description:
Stilbite up to 6mm, Natrolite (?) up to 13mm
 Viewed:  1211 Time(s)

natrolite-stilbite3.jpg


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Tobi




Joined: 07 Apr 2009
Posts: 2981
Location: Good Old Germany


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PostPosted: Nov 02, 2018 03:09    Post subject: Re: Zeolites and other Icelandic minerals from Hvalfjörður  

Thank you so much for the impressions of your field trip - please more!!!
Iceland is such a fascinating country, it's interesting to see how minerals are found in this beautiful landscape ...
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vic rzonca




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PostPosted: Nov 02, 2018 07:52    Post subject: Re: Zeolites and other Icelandic minerals from Hvalfjörður  

Dihydrogen monoxide seems very common in this land. "Iceland is the only place on Earth where the mid-ocean ridge rises above sea level. More eruptions than usual occur on the plate boundary across Iceland because under the ridge is the Iceland mantle plume, which has been active for the last 65 million years. During this period it has brought unusual amounts of magma to the surface forming the North Atlantic Large Igneous Province that now stretch across the Atlantic from Scotland to Greenland. Iceland is the youngest part of the province and the only one that is still active. The province is approximately 2000 km long and represents about 10 million cubic kilometres of magma that has emerged from the Iceland mantle plume through volcanic activity in 65 million years; a figure that is roughly 50 times the volume of Iceland." from the Outline of Geology of Iceland Chapman Conference 2012
by
Thor Thordarson
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