NWA 10690 - Anomalous Sanidine-rich (K-Feldspar) LL Metachondritic Breccia for Sale

NWA 10690 - Anomalous Sanidine-rich (K-Feldspar) LL Metachondritic Breccia For Sale

When you click on links to various merchants on this site and make a purchase, this can result in this site earning a commission. Affiliate programs and affiliations include, but are not limited to, the eBay Partner Network.

NWA 10690 - Anomalous Sanidine-rich (K-Feldspar) LL Metachondritic Breccia:
$6.51

NWA 10690

Found Sahara, 2016

Metaporphosed Chondrite

LL7 (brecciated)

Sanidine (K-Feldspar bearing)

Specimen is a 0.20g slice

Combined shipping : Always 5$ regardless the number of specimens in the package

NWA 10690 is a NWA 7030 pairing

NWA 7030/10690 is a olivine-rich, orthopyroxene and clinopyroxene,totaly recrystallized meteorite(no chondrules or chondrules relict) with a very (very) unusual interstitial potassium feldspar, a mineral called sanidine (accesory phases taenite, somechromite and troilite). The overall texture is that of a fine grained igneous cumulate rock (poikiloblastic texture).

Altough NWA 7030/10690 was shown to have affinities to the LL-chondrite group (mainly oxygen isotopes), it has many anomalous features that make it unique, and therefore, could be considered as ungouped. The K-Ar age was determined, and the result indicate the occurence of two separate impact heating/degassing event that have distorbed this isotopic chronometer : one at ~4.12Ga and the other at ~2.39Ga (Fernandes et al., 2014)

> READ MORE ON NWA 7030 ON METEORITESTUDIES<

From the Meteoritical society Database :

Northwest Africa 10690Basic informationName: Northwest Africa 10690
This is an OFFICIAL meteorite name.
Abbreviation: NWA 10690
Observed fall: No
Year found: 2016
Country: (Northwest Africa)
Mass: 243 2 Jul 2016WriteupWriteup from MB 105:

Northwest Africa 10690(NWA 10690)

(Northwest Africa)

Purchased: 2016 Mar

Classification: Ordinary chondrite (LL7)

History: Purchased by Fabien Kuntz in March 2016 from a dealer in Ouarzazate, Morocco.

Petrography: (A. Irving and S. Kuehner, UWS) Very fresh specimen with poikiloblastic texture and no evidence of relict chondrule structures. Minerals are olivine, orthopyroxene, clinopyroxene, sodic plagioclase, potassium feldspar, taenite, chromite, troilite and rare chlorapatite. Some feldspar consists of perthitic intergrowths of potassic and sodic phases.

Geochemistry: Olivine (Fa29.9-30.0, N = 3), orthopyroxene (Fs23.4-23.5Wo3.7-3.6, N = 3), clinopyroxene (Fs10.3-12.1Wo42.5-38.9, N = 2), plagioclase (An6.4-7.2Or3.2-3.5, N = 2), potassium feldspar (Or83.6-87.3An6.1-5.7, N = 2).

Classification: Ordinary chondrite (LL7, K-feldspar-bearing).

Specimens: 20.45 g including one polished thin section at PSF; remainder with untz.

Data from:
MB105
Table 0
Line 0:Place of purchase:ZagoraDate:P 2016 MarMass (g):243Pieces:1Class:LL7Shock stage:S2Weathering grade:W0/1Fayalite (mol%):29.9-30.0Ferrosilite (mol%):23.4-23.5Wollastonite (mol%):3.7-3.6Classifier:A. Irving and S. Kuehner, UWSType spec mass (g):20.45Type spec location:PSFMain mass:F. KuntzComments:K297; submitted by A. IrvingInstitutions
and collectionsPSF: Planetary Studies Foundation,10 Winterwood Lane, Unit B, Galena, Illinois 61036-9283, United States; Website (institutional address; updated 1 Dec 2011)
UWS: University of Washington, Department of Earth and Space Sciences, 70 Johnson Hall, Seattle, WA 98195, United States (institutional address; updated 15 Jan 2012)
Kuntz: Fabien Kuntz, France; Website (private address)

WE COMBINE SHIPPING

Payment and Shipping

I combine shipping, means you will pay only one time the S&H fees regardless the quantity in the package. Usualy you will pay a total of 2$ for all your items put together in one, or two packages.

I accept Paypal or bank to bank transfer.

If you have any question, please contact me.