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Zeolites from Lanzarote

Last Updated: 15th Jun 2008

By Volker Betz

Hello !

This will be continued from time to time.

Discovery of the location



The Canary islands have not been well known for any minerals as I first visited Lanzarote in 1983, with the exception of Olivine xenolithes which are offered to the tourists on the road to El Golfo. At that time most of tourism took place at Puerto del Carmen. Playa Blanca at the south coast was a small village at the end of the paved road on the way to the Playa de Papagayo. There was a small hotel, a restaurant, a supermarket, the ferry harbour to Fuerteventura and Casas del Sol, the first apartments and a lot of dry and dusty area. On the way to the Playa de Papagayo the red tuffs east of the village have been visible from distance and above the Castillo de las Coloradas.

The Castillo is situated on a cliff and nearby a swarm of basaltic dikes intrude the old basalts which build the coastline in the south of Lanzarote. Tuff and dikes in old basalts is a good reason to look for zeolites. I did so and a first sample was found at not far from Castillo ( Arrow at location 2 ) . This first sample was one of the rare species from this location, a Cowlesite. It remained unidentified for several years. On the topographic maps the location was named Punta del Aguila.

08786300014946875512670.jpg
Cowlesite, the first of specimen collected


In the following years and vacancies the area was visited several times and a couple of specimens could be saved from several places around Punta del Aguila. A approximate distribution of zeolites and loactions I collected is given below.

08049020014961188785510.jpg
Zeolite Occurence E of Playa Blanca, click picture for full size.



The time frame I collected is from 1983 to 1993. A first paper was published in 1986. It was soon visible that all the area was under construction for future touristic development. The extend and amount of this growth I could see in March 2008.

The area along the southern shoreline which was mostly empty and barren, is now covered by streets, hotels and houses, shopping centres and a huge marina, which was built just west of Castaillo de las Colorados. Most of the cliffs are still untouched but a paved Paseo Maritima follows the cost line from the west edge of the island until the border of the Papagayo reservation. Just west of the Castillo it covers a zeolite occurence. The area N and NE of the Castillo is urbanised, and was during road and house workings temporary a good collecting zone.Very good colleting was possible from 2000-2003 in the whole area during building works. The excavated basalt was piled in this years and later used to prepare the marina. (Kratzsch, pers. comm., 2008) The cliffs E of Castillo are still accessible but the collecting possibilities limited.

Zeolite occurences in Detail



The zeolites occur at severals zones, with areas with no zeolites between. I have counted a few areas with abundant zeolites. After 1993 other collectors may have discovered other spots and I would like to get messages about.

AREA 1 (see number on map)

09552170014946286424351.jpg
Zeolite Area 1


05155050014977459107468.jpg
Phillipsite, Levyne
06261600015652178095485.jpg
Levyne
07269490015652178091769.jpg
Levyne
This about 250 m NW of the Castilla. In the 1980 this looked like some quarry of the red tuff and zeolite rich basalt was exposed on the surface at the corner to the cliff.With some hammer an chisel work in the brittle rock cavities with Levyne, Phillipsite and Chabasite could be found. Phillipsite spheres up to 2 cm occured, but only fractions could be saved. Chabazite was mostly in the “Phacolite” form. Today this place is urban area, but two spots of the zeolite rich area are exposed just west of the Paseo Maritima. Some of the specimens from here are (click on the picture for full size):
06242160014977228248009.jpg
Phillipsite
08516380015652178091857.jpg
"Phacolite", Levyne
09276090015652178093181.jpg
Levyne, Chabazite
03389470014977232718448.jpg
Levyne
00176220015652178108900.jpg
Levyne
01054130015652178106177.jpg
Levyne
02087230015652178106664.jpg
Todorokite Levyne
03365760015652178108513.jpg
Levyne
08905720014946875533584.jpg
Hand specimen with three cavities of different mineralisation: From left a cavity with Phillipsite, then Levyne with Chabazite (Phacolite) and at right Chabazite in rhomboeders.


AREA 2 (see number on map)

09731070014946875531194.jpg
Zeolite Area 2



This is just W of Castilla. Where the arrow points at the map, the first specimen has been collected. In this zone basaltic dykes cross the red tuff and the basalt layers. From here fine Chabazite specimens have been collected. This is also the place where perimorphoses of clay minerals after Aragonite and Todorokite are found.

Some of the specimens from here are (click on the picture for full size):

04349020015652178107362.jpg
Chabazite on Calcite
04989510015652178105898.jpg
Chabazite on Calcite
05581970015652178104118.jpg
Chabazite
01207380014977228509319.jpg
Chabazite
06567210015652178103820.jpg
Chabazite
01523580014950499277045.jpg
Perimorphose
07351070015652178109856.jpg
Cowlesite
08346850015652178106070.jpg
Chabazite
09593340015652178105319.jpg
Todorokite
00472030015652178111532.jpg
Todorokite
01343450015652178113150.jpg
Thomsonite on Chabazite
01933480015652178114948.jpg
Thomsonite on Chabazite-twin




AREA3 (see number on map)

03761080014946875553997.jpg
Zeolite Area 3



Zeolites are also present at the bay just east of the Castillo. There are three different spots. About in the middle of the bay at the upper edge of the cliff nice Levyne with epitaxial Erionite overgroth could be collected with some hammer and chisel work. This spot is now only a few meters from the Paseo Maritima.

04668940014946875554851.jpg
A larger cavity with Levyne with Erionite overgrowth
03129600015652178114540.jpg
Levyne
03702570015652178113012.jpg
Levyne, Smectite


Another spot is the half way down the cliff, there is a possibility to climb down. Danger ! From here a few very small cavities with Cowlesite could be saved, Analcime, Chabazite, Thomsonite and Mesolite/Natrolite is also present.

04307480015652178111475.jpg
Phacolite
05130610015652178115677.jpg
Analcime
05742330015652178116377.jpg
Cowlesite with Levyne/Erionite
06474470015652178113039.jpg
Cowlesite on Smectite




The best spot in this area is a small beach cave at the eastern corner of the bay (arrow on the map). There was a possibility to climb down, but the cave can only entered at low tide. From boulders and the ceiling of the cave (hard rock)very attractive Mesolite/Natrolite specimens clould be collected. Cavities are up to 10 cm and contain also small Chabazite and Calcite with Thomsonite-coating.

Some of the specimens from here are (click on the picture for full size):

01777550014946875564113.jpg
Mesolite with Natrolite-Epitaxial overgrowth on a crust of chabazite crystals. Black spots are most likely Todorokite.


07300110015652178119917.jpg
Mesolite/Natrolite
07789860015652178114261.jpg
Mesolite/Natrolite
09701070015652178114955.jpg
Mesolite/Natrolite
00589440015652178121627.jpg
Mesolite/Natrolite
01204290015652178126708.jpg
Mesolite/Natrolite
01762380015652178125876.jpg
Mesolite/Natrolite
02388150015652178128431.jpg
Thomsonite on Calcite
03125370015652178129856.jpg
Todorokite
00436240014946875573810.jpg
Mesolite/Natrolite epitaxie with Thomsonite-Ca on Calcite

AREA 4 (see number on map)

Zeolites are also present near the east end of the cliffs towards Playa de las Colorados, a gravel beach. From the beach the lower end of Cliff can easy accessed at low tide and calm water. Small geodes with Analcime, Thomsonite, Chabazite and Mesolite are frequently present. The access to the cliff parts between zone 3 and 4 is difficult as there are sections with deep water.

01459500014946875579171.jpg
Analcime


Boulders from road cut and landscaping just west of Playa de las Coloradas made collecting of nice calcite crystals possible, typical associated with small Chabazite and some Mesolite, all covered with a thin layer of Calcite.

02590370014946875573954.jpg
Calcite


04552870015652178121923.jpg
Calcite
09182540014977459108989.jpg
Calcite
05801720015652178123488.jpg
Calcite
06453920015652178127731.jpg
Calcite


AREA 5 (see number on map)

This is located a few hundred m N of Play de las Colorados. Trenches perpared for sewerage pipelines where temporary open . Here relatively large cavities up to 40 cm contained a mostly altered paragenesis with Calcite, Thomsonite and Mesolite. The rock was very brittle and weathered but some nice specimens could be saved.

07247780015652178124555.jpg
Mesolite/Natrolite
07757210015652178128136.jpg
Mesolite/Natrolite from top
08537510015652178126139.jpg
Mesolite/Natrolite
09370040015652178126078.jpg
Mesolite/Natrolite
00749840015652178135315.jpg
Calcite,Mesolite
09472140014967839684767.jpg
Mesolite on Calcite
02480960015652178138748.jpg
Calcite,Thomsonite
03006910015652178131496.jpg
Calcite,Thomsonite
03895880015652178134378.jpg
Calcite on Mesolite
07504890014946875586069.jpg
Mesolite, Natrolite, Thomsonite, Chabazite,Calcite



AREA 6 (see number on map)

08444490014946875589641.jpg
View from east with Castillo de las colorados at left and recent Hotel buldings over area 6, from about the position of zeolite area 4. Picture by Alfred Passath, Feb. 2007


04614750015652178138252.jpg
Calcite

This is N of Castilla de las Colorados and now buried under hotels and streets. Boulders laying around contained some of the best specimens of Thomsonite, Chabazite and Analcime from Punta del Aguila. This is also one of the areas where other collectors have been active as long it was possible.
05145060015652178139188.jpg
Chabazite
05901490015652178132506.jpg
Chabazite
06656440015652178136738.jpg
Chabazite, Thomsonite
09006450014977229401757.jpg
Chabazite
05124650014946875594371.jpg
Analcime on Smectite
08407470014977229397367.jpg
Chabazite
09410330014977229166555.jpg
Thomsonite, Chabazite
09054250015652178136034.jpg
Thomsonite
01579220014977229607173.jpg
Mesolite, Thomsonite detail from picture left


00940430015652178144344.jpg
Mesolite
01816890015652178145208.jpg
Chabazite, Thomsonite,Mesolite
02599390015652178141639.jpg
Thomsonite
03561880015652178143110.jpg
Thomsonite with Chabazite on Analcime
04490590014946875606410.jpg
Thomsonite-Ca with Todorokite and Chabazite


Some remarks on Zeolite crystal chemistry, nomenclature, morphology and paragenesis.



Zeolite mineralization at Punta del Aguila lacks of scientific investigation, except some individual analysis. Concluding from data given by KRATZSCH (2001) and ERICH KECK (pers. comm.), Chabazite and Phillipsite are frequently Na-dominated and hence Phillipsite-Na and Chabazite-Na. But there is no evidence that this is always the case. It can be presumed that the minerals are formed as Chabazite-Ca and Phillipsite-K and later ion exchanged due to contact to marine water. The Mesolite has been investigated by TSCHERNICH (1992) and found to be have an epitaxial overgrowth with Natrolite. Levyne has been identified as Levyne-Na (Kratzsch, pers. Comm.) and at least in one case the epitaxial Erionite-overgrowth was found to be Erionite-K (TONI WIELAND, pers. comm.)

Concluding from recent works (WEISENBERGER & SELBECK, 2008, NEUHOFF ET. AL, 1999) the zeolite formation in the cavities of the basalts occurred after heating by burial (with younger lavas) and intrusion of basaltic veins. Precipitation of Zeolites is following a temperature (and burial depht) dependent order. At eastern Iceland the zeolite zones are distributed over a vertically distance of more than 2.5 km. At Punta del Aguila only the Chabazite/Thomsonite zone seems to be visible, which is the top level of zeolite formation at tempartures below 70° C. The first minerals preciptated in the cavities are a mixed layer of Chlorite/Smectite and a early generation of Calcite, followed by the other Zeolites. It is attracting attention that the Zeolites at Punta del Agiuila are partially coated by a intensive yellow coating. At a first glance this may be the typical Fe-Oxide staining. But the frequent presence of Todorokite, partly in well developed crystals indicates that possibly Mn-Oxides play a role in that colors.


Paragenesis and Succession



The order of succession of the minerals found at Punta del Aguila is not easy recognized from the samples found. Comparison with samples from other locations and consideration of known successions help, but still there may be no complete evidence.

Aragonite seems to be the first mineral built in the cavities. It was only found as empty perimorphoses of Chlorite/Smectite and is now dissolved. Similar Perimorphoses and Aragonite are known from other zeolite locations e.g Ortenberg, Vogelsberg, Hessen. So even if there is no evidence locally, it can concluded from the form that it was Aragonite.

Clorite/Smectite mixed layers is one of the typical early stage cristallisations of zeolite assemblages. A paper of Weisenberger & Selbeck (2008) describes this in detail.

Calcite is common at Punta del Auguila and appears in several generations. One generation of steep scalenohedrons was formed before the Zeolites and it is often coated by Thomsonite and Chabazite. The late calcite crystals build rhomboeders an are mostly small. Crystals range from a few mm up the a few cm.

Mesolite forms very attractive sprays of fibrous crystals. In many cavities they are prominent and seem to have been grown on Chabazite. A closer look show that they started to grow on the cavity wall or from Calcite and the empty space on the wall has been later covered by Chabazite. Mesolite has been found to build an epitaxy with a younger generation of Natrolite forming a thin coating. Mesolite is also often associated with small bladed Thomsonite crystals and Chabazite. This is a typical paragenesis for many zeolite occurences. All three minerals grow on Calcite crystals and direct on the cavity wall.


Levyne occurs at Punta del Aguila in cavities with Chabazite in the “Phacolite” form and is the earlier crystallisation. At one sample it is covered by Phillipsite. Levyne is partly covered by Erionite. This Epitaxies have been first described as Levyne/Offretite but are now almost everywhere known as Levyne/Erionite. On very few samples Levyne is also associated as a younger phase with Cowlesite. Cowlesite forms very thin blades with a characteristic luster and is the rarest zeolite species from Punta del Aguila.

Chabazite and Thomsonite-Ca follow in the succession. As Thomsonite is present on Chabazite and Chabazite also covers Thomsonite they seem to crystallise together. It may be that the Thomsonite blades continues longer to grow than Chabazite. Phillipsite occures mostly together with Chabazite in the same sequence and is not very common.

Thomsonite is a Zeolite very variable in appearence . At Punta del Aguila it forms always aggregates of thin tabular crystals and also fine fibers. It is frequent present in small amounts at the starting point of the Mesolite/Natrolite bundels and also covers Calcite crystals. Chabazite is also very variable in form and habit due to its complex twinning. On the Mesolite specimens Chabazite crystals form a thin crust, but the “Phacolite” variety and well formed rhomboeders are also present. Chabazite also builds crusts on Calcite.

Todorokite seems to be the last mineral formed in the cavities. It forms black to red-brown blades either alone or on Zeolites. Thin blades are transparent and reddish.
Todorokite is frequent in minute crystals on some of the Mesolite/Natrolite specimen from collecting area 3.




To be continued ! If you see errors give me a hint!
12.5. 2008:Typing errors corrected,thanks to José Rafael González López.
15.6. 2008 Some Info given by E. Kratzsch added. Thanks to E. Kratzsch.






Article has been viewed at least 37538 times.

Discuss this Article

29th Mar 2008 10:46 GMTDaniel Russell

Wow! Great photos, and thank you for sharing this! I look forward to your next installment(s).

30th Mar 2008 21:33 BSTTrevor Boyd

Really interesting Volker - cant wait for the next one! T

30th Mar 2008 21:37 BSTGiovanni Fraccaro Expert

Compliments!!!
Very interesting article and beautiful photos!!

5th Apr 2008 21:04 BSTRicardo Pimentel Expert

Dear Volker,

Zeolites are not easy to photograph. But from your pictures it looks easy ;-)

These pictures are beautiful, the data very useful… an excellent article! Congratulations!


6th Apr 2008 08:16 BSTDominik Schläfli Expert

Dear Volker,
Wonderful Article! I added a link to it from the Punta del Aguila locality page.
best regards,
Dominik

8th Apr 2008 18:47 BSTUwe Kolitsch Manager

Wunderbare Photos!
Hatte auch schon Link auf die Lanzarote-Seite gelegt.

11th Apr 2008 12:13 BSTDomenico Preite Expert

Big congratulation, very good photo's CIAOOOO

11th Apr 2008 13:37 BSTMartin Stevko Expert

Superb article and brilliant photos!

18th Apr 2008 02:36 BSTJohn Truax

Wow beautiful photos and specimens, and it is so interesting to me. Thank you for sharing this Mr. Betz~!

22nd Apr 2008 14:08 BSTEddy Vervloet Expert

Great article! Great pictures!
Thanks, keep' em coming!

29th Apr 2008 06:20 BSTJeremy Zolan

Mr. Betz,

I would like to compliment you on an absolutely wonderful article on a fascinating array of localities, complimented by excellent photos. You're article is making me consider this beautiful place and collecting the outstanding zeolites it has to offer! I look forward to seeing more articles from you!

-Jeremy Zolan

17th May 2008 15:45 BSTAntónio Manuel Ináçio Martins

Mr. Betz...zzzz of Zeolite :-)

I have a weak with zeolites and what can say! Good work......mainly with the photos.....congratulations.
To be continue :-)

Martins da Pedra

16th Jun 2008 10:30 BSTChris Mavris Manager

Thanks for your contribution for the mineralogy of these wonderful places!!

Hopeful you are going to continue with your invstigation ;)

Chris

20th Jun 2008 23:44 BSTRobert Müller

Superb photos and minerals
Robert

3rd Feb 2012 10:47 GMTFabio Brignoli Expert

Mr. Betz

Beautiful photos and specimens, great article!

Fabio
 
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