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Zhob
Basic information Name: Zhob
     This is an OFFICIAL meteorite name.
Abbreviation: There is no official abbreviation for this meteorite.
Observed fall: Yes, confirmed fall
Year fell: 2020
Country: Pakistan
Mass:help 18.96 kg
Classification
  history:
Recommended:  H3-4    [explanation]

This is 1 of 19 approved meteorites classified as H3-4.   [show all]
Search for other: H chondrites, H chondrites (type 3), Ordinary chondrites, and Ordinary chondrites (type 3)
Comments: Approved 23 Feb 2020
Writeuphelp
Writeup from MB 109:

Zhob        31°22’N, 69°34’E

Baluchistan, Pakistan

Confirmed fall: 2020 Jan 9

Classification: Ordinary chondrite (H3-4)

History: (M. Farmer, Arizona) A bright fireball followed by sonic booms was seen and heard around the northern part of the Baluchistan province of Pakistan, approximately 6:30 pm local time on 9 January 2020. Shortly thereafter, a stone fell through a house in a local village of the Mando Khel tribal area ~12 km NE of Zhob, Zhob District, Baluchistan province, Pakistan. The largest stone was found shortly after the fall by goat herders. Two more stones were subsequently found in this area.

Physical characteristics: To date, four fusion-crusted stones have been found: 6.309, ~5.5, 4.924, and 2.231 kg. The stones are blocky to rounded, with broad shallow regmaglypts, and covered with black matte fusion crust. The 6.309 kg stone is broken, exposing ~15 × 9 cm of the interior, which displays a breccia of rounded to sub-rounded, light-colored clasts in a light-gray matrix. The clasts range from 1 cm to 5 × 4 cm. The stone is easy to break and weakly consolidated. The measured density of a 24 g fragment that contains both the lithologies is 3.18 g/cm3.

Petrography: (L. Garvie, ASU) The exposed surface of the 6.309 kg stone has an earthy luster, with scattered small (<1 mm) chondrules and rare troilite fragments to 4 mm. No shock veins are visible. Two polished mounts were examined from the gray matrix and a large light-colored clast, respectively. Gray matrix: Section dominated by chondrules and chondrule fragments set in a fine-grained fragmental matrix. Chondrules abundant and clearly visible under a petrographic microscope and BSE imaging, with an apparent mean diameter of 460 µm (n=36). Some PO and PP chondrules show phenocrysts with clear zoning. A PO and BO chondrule contains transparent purple glass. Fe-Ni metal dominated by two grain types: the first is irregularly shaped, with holly-leaf-shaped outlines, to 200 µm grains of kamacite that are single crystals exhibiting weakly developed Neumann bands; the second are rounded grains up to 150 µm, with thin taenite rims enclosing cores of dark-etching plessite. Native copper is rare occurring as grains to 20 µm between Fe-Ni metals and troilite. Troilite grains to 150 µm are largely single crystals and lack shock lamellae. Chromite is a common accessory mineral, occurring as anhedral grains to 200 µm and as fine-grained chondrule-like aggregates to 300 mm. Light-colored clast: The petrography and chondrule size in this clast is similar to the gray matrix section, but differs in showing a coarser grained matrix with abundant feldspathic phase up to 20 µm, and lacking chondrules with zoned olivine or pyroxene-bearing phenocrysts.

Geochemistry: (A. Wittmann, L. Garvie, ASU) Gray matrix - Olivine (n=23) Fa17.2±6.6, range Fa0.7-34.3, Cr2O3 to 1.2 wt% and CaO to 0.5 wt%. FeO/MnO = 38.6±7.9. Low-Ca pyroxene (n=20) Fs13.8±5.3Wo1.3±1.1, FeO/MnO = 25.1±10.3. High-Ca pyroxene (n=2) Fs1.1Ca45.9 and Fs24.2Ca30.5. Light-colored clast - Olivine (n=14) Fa18.5±0.24, range Fa17.9-18.8, FeO/MnO = 37.8. Low-Ca pyroxene (n=17) Fs15.3±0.3Wo1.3±0.1, FeO/MnO = 23.4. Kamacite: Ni 6.71-7.08 wt%, Co 0.44-0.48 wt%. Feldspathic phase (stoichiometry is poor, FeO is fairly high): Ab81.4-83.1An10.7-12.6Or4.3-6.5 (n=10).

Classification: H3-4. Breccia of H4 clasts in an unequilibrated H3 host matrix. W0 and S2.

Specimens: The 6.309 and 2.231 kg stones are with MFarmer.

Data from:
  MB109
  Table 0
  Line 0:
State/Prov/County:Baluchistan
Date:2020 Jan 9
Latitude:31°22'N
Longitude:69°34'E
Mass (g):18964
Pieces:4
Class:H3-4
Shock stage:S2
Weathering grade:W0
Fayalite (mol%):H3 17.2±6.6, H4 18.5±0.24
Ferrosilite (mol%):H3 13.8±5.3, H4 15.3±0.3
Wollastonite (mol%):H3 1.3±1.1, H4 1.3±0.1
Classifier:L. Garvie, A. Wittmann, ASU
Type spec mass (g):54
Type spec location:ASU
Main mass:MFarmer
Comments:Submitted by L. Garvie
Institutions
   and collections
ASU: Center for Meteorite Studies, Arizona State University, Tempe, Arizona 85287-1404, United States; Website (institutional address; updated 14 Jan 2012)
MFarmer: Michael Farmer, P.O. Box 86059, Tucson, AZ 85754-6059, United States; Website (private address)
Catalogs:
References: Published in Meteoritical Bulletin, no. 109, in preparation (2020)
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Photos:
CreditPhotos
Photos uploaded by members of the Encyclopedia of Meteorites.
    (Caution, these are of unknown reliability)
Dave Johnson   
Public domain photographs:
Laurence Garvie   
Geography:

Pakistan
Coordinates:
     Recommended::   (31° 22'N, 69° 34'E)

Statistics:
     This is 1 of 3 approved meteorites from Baluchistan, Pakistan
     This is 1 of 17 approved meteorites from Pakistan (plus 1 unapproved name)
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