View a list
of fine Ureilites
Ureilites are a rare class
of diamond rich achondrites
are in contrary to many achondrites not igneous differentiates, but ultramafic
meteorites, which are almost always highly fractionated.
They are composed mainly of magnesian
olivine, pyroxenes (often occuring as pigeonite crystals), free
(Ni-)Iron, graphite and diamond inclusions.
Their mineral and oxygen
isotopic compositions suggest that they formed as residues from
Despite the fact that ureilites have
undergone a planetary differntiation history process, to some degree
they also have primitive characteristics (like presence of
free NiFe and oxygen
isotopic signature of primitive/unequilibrated solar system materials).
The ureilites are subdivided
into two main groups:
(more common) monomict main group
(for space science highly
interesting is the rare) polymict group:
Gruppe bestehen in erster Linie aus grobkörnigen
Olivinen. Begleitmineralien sind kalzium-armer Pigeonite (ein
Pyroxen). Die dunkle kohlehältige Matrix besteht fast stets aus
einem Gemenge der reinen Kohlenstoffvertreter Graphite and Diamant.
Auch freies FeNI und Troilit sind häufig)
Members of this group
are built up of a mixture of different lithologies.
Except clasts of
the monomict ureilite lithology, they may contain magmatic
chondritic relics as well as sometimes other surprising
This fact and the specific values for noble
gases may point to a regolith origin for the polymict ureilites.
Please click below on underlined
meteorite title names to see more detailled descriptions
Monomict Ureilite (unclassified) from
Northwestern Africa: nice material: $11/gr
available: 4g, 21gr,43gr
polymict ureilite, Name : DAG 319
(FeO/MgO) Dar al
Gani , highly beautiful, diamonds!
clasts in the Dar al Gani 319 polymict ureilite: Precursors of the ureilites
(Ikeda et al)
Lithic and mineral clasts in the Dar Al Gani (DAG) 319 polymict
ureilite (Ikeda et al)
0,38g 5x5mm slice $29, slice 0.51g 6x7mm $48 ; 0,65g
0.63g 7x7mm; 1.15g slice 10x13mm;
1 bug box (appr.0.15g
appr.5x3mm) : $ 12
comes complete with
DaG 868 -
Ureilite (unshocked diamondrich)
diamonds were always thought to have been formed by impact shocks.
PTS of DaG 868
A new type of Ureilite (
DaG 868 ) has been discovered and was published now.
The features of DaG 868
seem to suggest that reconsiderations about the origin and building history
of ureilites are necessary now:
The Ureilite is containing fine-grained
diamonds but olivines appear to be unshocked (show no evidence of undulose
Graphite found in pigeonite crystals in DaG 868 however
This suggests that the diamonds have not(!) been formed by
shock impact or chemical vapor deposition
and such raises major questions about
building history of ureilites.
Catalytic transformation of graphite to
diamond will be a mechanism to be considered for this new ureilite type.
Such DaG 868 falls in an own group of " weakly shocked diamonds "with" the
presence of diamonds" with ALH 78019 and 78262..
History: A 40.03 g
ureilite meteorite was found on 13th of April of 2000 by anonymous
finder in DaG in
the Central Saharan desert.
mineralogy (H.Takeda,Chiba and M. Ohtsuki UTok):
meteorite has a
typical texture for ureilites consisting of anhedral to subhedral olivine
and pigeonite (0.9 – 3 mm across);
Carbonaceous material forms rims around
some grains or, in some cases, veins; one plate of graphite occurs within a
large pigeonite crystal;
interesting fact on this material is that the olivines appear to
be unshocked compared to most ureilites, and have homogeneous cores (Fa20.6)
and reduced rims (Fa8) with high CaO contents (0.25-0.38 wt.%);
X-ray diffraction and reflected light microscopy (T.
Nakamura and T. Nakamuta, KyuU) confirm the presence of fine-grained
diamonds in a graphite lath.
Specimens: main mass with anonymous
finder; type specimens, 6.33 g, NSMT; 1.8 g,KyuU.
BB $35; 0.1g sold
; 0,24g; 0,8g 16x15mm slice; 0.5g sold
almost complete slice sold
Please kindly ask
for availability of slices: firstname.lastname@example.org
DaG 976 -
with (prov.) CI inclusions:
1 meteorite of 32.033g was found 1999 Aug.20th
available are thin slices of 0,4g sold/traded, 1.4 g, 1,5g sold/traded
Please ask for availibility and price (limited supply) : email@example.com
DaG 977 - polymict
PTS of DaG 977
A total mass of 17g crust was found 2000 in the desert region of DaG, Al Juffrah
Available are slices of 0,1g sold; 0.41 g sold, 0,55g sold; 0.89g 14x12mm,
endpiece 1,3g @ $83/gram;
representative large slice of 1.7g $120S
Thin sections (PTS): $95/pce.
polymict ureilite - DaG
Numerous fragments totaling 2,106 g were found on 2000 April 14 in the sand desert
of Dar al Gani. Classification and mineralogy: (A. Greshake and M. Kurz):
a fragmental breccia with mineral and lithic clasts set into a ureilitic matrix
dominated by large olivines;
olivine core, Fa14.3-23.5; reduced olivine rims, Fa2.9-13.5;
mineral clasts are pigeonite, Fs14.3Wo8.5 and orthopyroxene, Fs9.3;
lithic clasts consist of fine-grained olivine (Fa22) and pyroxene
(Fs19.3Wo4.5) rich material;
shock stage, S3; low degree of weathering.
type specimen 20.8 g plus one polished thin section MNB
3g; 3.7g; 4.5g @$55/g; 76.8g; 111g
Available only through us!
Special: polymict Ureilite DaG999 - 39.8g
fresh complete individual
80% black - blueish fusion crust
Top side is loosely covered with some original Saharan sand!
polymict Ureilite (with Enstatite - pyroxene), polymict - Dar al Gani 1023
One of the world's most heavily
Found August 19th 1999 , Dar Al Gani plateau Al Juffra.
A ureilite meteorite of 149 g was found by an anonymous collector in the Dar al
Gani desert. Mineralogy and classification (H. Takeda, Chiba; T.
Ishii and M. Ohtsuki, UTok): fragmental breccia, with lithic and
mineral clasts embedded in a cataclastic matrix of predominantly
ureilitic material. Lithic clasts and fragments include mafic
ureilitic material (olivine 86 vol. % and pyroxene 12 vol. %),
Na- rich plagioclase fragments
and rare subrounded, dark brown Na-, K- rich glassy grain
(SiO2 68 wt. %, Al2O3 13.6 wt. %, MgO 5.6 wt. %,
CaO 5.3 wt. %, Na2O 6.3 wt. %, K2O 0.8 wt. %). The pyroxene
composition ranges from En79Wo6 to En62Wo4 and En59Wo31; olivine
composition ranges from Fo90 to Fo75. The plagioclase composition
ranges from An13Ab85 to An33Ab62.
A slice of a lithic clast of 3.7 2.7 cm in size
(subsample ,02; 6.89 g slice), is one of the most heavily shocked ureilites known.
All mafic silicates are converted into very fine grained materials
with a granoblastic texture;
carbonaceous vein materials are lost from many grain boundaries;
glassy shock-vein materials are observed at some parts of the thin
section. Olivine (80 vol. %) is more abundant than pyroxene (20 %).
Pyroxene composition ranges from En86Wo2 to En77Wo10 and En69Wo6;
olivine composition ranges from Fo96 to Fo66. The ureilite meteorite is weathered,
with a brownish colour in hand specimen, but in thin section the
weathering grade appears to be very low. Specimens: type specimen,
20.752 g (including sample ,02), NSMT, one thin section, Chiba; main
mass with anonymous finder.
0.49g, segment; 0.58g slice sold; 1.1g sold; 2.8g slice 28x24mm ;
no pairing - Available only through us!
polymict Ureilite - DaG
A ureilite meteorite of TkW: 49.8 g was found
16-May-1999 by an anonymous collector in the Dar al
Classification: Meteoritical Bulletin:
Comments: Approved 24 Jul 2007 Data from: MB92 Table 1
Shock stage: Mod ; Weathering grade: Moderate
(mol%): 3.6-22.4, Ferrosilite (mol%): 3.7-22.4, Type spec mass (g):
Classified: A. Greshake, MNB. Type specimen: MNB. Main mass:
Polymict breccia with fine-grained chondritic lithologies
cut and polished
Euro 55/gr for
this rare Ureilite type
Please ask for
availibility (limited supply) :
Dho 132 - Ureilite
available: thin slice 0.33g 7x7mm $30 ; 1g 12x14mm $70; 2.9g slice $190
1 fresh looking,
oriented ureilite meteorite (split up in 1 big and 1 small pieces) with large greenish olivine clasts of 995g was found on 15.8.2002 in the
7x10x6mm fragment $48
1.4g 13x15mm beautiful slice $98; 3.1g- 20x26mm slice $199
rare type 2
Ureilite (such as Hajmah (a), Donga, or Dyalpur):
Click for availibility
1,4g slice 15 x11mm, endpiece 2.5g, $110 BB $16
Please ask for availibility
New! Very Unusual, Surprising: type 2 - Ureilite
Ureilite - NWA
contains the rare
mineral Suessite which is a very rare metalic mineral with the composition:
(Fe,Ni) 3 Si with very low Ni content (appr. 1-3) indicating that this
material is rather not from an asteroidic parent body.
type 2 - Ureilite
(such as Hajmah (a), Dingo Pup Donga, or Dyalpur)
Classification and mineralogy: (F.Wlotzka,
MPI, and M. Kurz, Germany)
covered with fresh fusion crust.
Olivine and pigeonite grains (up to 1mm) are set in a pavement texture of
smaller olivines containing finely dispersed metal grains.
Intermediate (type 2 - medium
reduced! ) FeO/MgO ratio in olivine cores: Olivine has Fo 80-83 in the cores
(with 0.7 -1.7% Cr2O3, 0.2-0.6% CaO).
Pigeonite has Fs 4-22, Wo 4-15, En 74-87, and 0.6-1.2% Cr2O3.
Carbonaceous matrix is rare,
graphite occurs in fine-grained patches. Coarser white reflecting grains are Suessite, (Fe,Ni)3Si, with 13% Si, 2.5% Ni (range 1-4%), 1.1% Cr. This rare
abundant in NWA 1241and occurs as blocky grains or interstial vein-like
forms. No kamacite and no troilite were found.
The mineralogy of NWA 1241 suggests
that it was formed at extreme pressures of appr. 100 bars and equilibration
temperatures of more than 1200°C!
This NWA 1241 is a valuable sample
for understanding the thermal history of ureilites parent body.
Type specimen: 20.5g MPI.
NWA 1241 9.005g.jpgNWA
1241-2 slices 1g.jpg
0.2g slice 4x5mm
with crust sold;
0.24g slice 4x7mm with crust ; 1.13g
1.24g slice with crust ; 3.10g beautiful slice with crust ; 13g
7 mm ; 21x16 mm ; 2.5 gr 34 x 37 mm
Ungrouped Achondrite from prev.
Ureilite - NWA 1500 - Prov. the first basaltic ureilite!
New analysis suggest that this highy interesting achondrite
could be brachinite related and probably originated from the Winona group
parent body and may not come as originally thought from the Ureilite parent body.
Studied by: Frank Wlotzka, B.Clayton, R.
thin slices $155/g; endpieces with crust $150/g
NWA 3077 -
AURE almost diamond free
1 piece partly covered with fresh fusion crust of 11.213g was found
early 2003 in the Occidental Sahara
rare Ureilite type; thin part slice with/without crust. Let us
kindly know which price/size range you might be interested in!
0,3g; 1,01g; Price
Total recovered mass: 9.024 kg. Classification: Typical texture of coarse (1-3 mm),
equigranular olivine (cores Fa 19.4, Cr2O3 0.55%)
pigeonite (Fs 17.4, Wo 9.0, Cr2O3 1.2%).
Classified by F. Wlotzka, Max-Planck-Inst. fur Chemie Dep.:Bartoschewitz
thin slices and segments: 1.9g; 2.4g; 3.8g Price
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