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Matera
Basic information Name: Matera
     This is an OFFICIAL meteorite name.
Abbreviation: There is no official abbreviation for this meteorite.
Observed fall: Yes, confirmed fall
Year fell: 2023
Country: Italy
Mass:help 117.5 g
Classification
  history:
Recommended:  H5    [explanation]

This is 1 of 11764 approved meteorites (plus 23 unapproved names) classified as H5.   [show all]
Search for other: H chondrites, H chondrites (type 4-7), Ordinary chondrites, and Ordinary chondrites (type 4-7)
Comments: Approved 14 Feb 2024
Writeuphelp
Writeup from MB 113:

Matera        40°41.7302’N, 16°35.0663’E

Basilicata, Italy

Confirmed fall: 2023 Feb 14

Classification: Ordinary chondrite (H5)

History: In Italy, on the evening of 14 February 2023 at 18:58:30 UTC, a brilliant bolide of absolute magnitude -10 appeared in the skies over Puglia and Basilicata. This fireball was detected by three all-sky cameras of the PRISMA network (Prima Rete Italiana per la Sorveglianza sistematica di Meteore e Atmosfera). PRISMA network is coordinated by INAF, the Italian National Institute for Astrophysics, and is also part of the international FRIPON project (Fireball Recovery and InterPlanetary Observation Network). The best view of the bolide came from the Castellana Grotte camera, which captured it as it crossed the sky as a progressively brighter ball of light. The PRISMA network also received 30 visual reports via the IMO, made by casual witnesses because, given the favorable hour, it was observed by several people. The bolide was also seen in Croatia and Slovenia. By triangulating the position data obtained from the three cameras, D. Barghini, A. Carbognani, and D. Gardiol (PRISMA team) traced the trajectory followed by the bolide in the atmosphere: it began to shine at an altitude of about 86 km and followed a downward trajectory inclined about 60° to the ground, moving with an initial velocity of 16.5±0.2 km/s from Bari toward Matera. On the evening of 16 Feb, C. Falco (PRISMA team) arrived in the calculated strewnfield area and began coordinating the fieldwork. While the meteorite search campaign was taking place, on the afternoon of 17 Feb, the Losignore brothers (Gianfranco and Pino) found several fragments of "strange material" on the balcony of their home. Images of this material were brought to the attention of the PRISMA team in the evening. On the morning of 18 Feb, C. Falco visited Losignore’s home and confirmed that these were the meteorite fragments being searched for. Immediately afterwards, a thorough visual inspection of the roof allowed the recovery of some other fragments and the ascertainment that a photovoltaic panel had been broken due to the impact of a meteorite fragment. From that moment on, the search by many volunteers who rushed in concentrated on the grounds around the dwelling, and over the next three days (Feb. 19-21) various samples were recovered, including the main mass of 46.21 g. To date, the total known weight of the Matera meteorite amounts to 117.5 g. Noteworthy, Matera is the second Italian meteorite, after Cavezzo (Gardiol et al., 2021; Pratesi et al., 2021), to be found thanks to a strewn field calculated by PRISMA Network followed by a well-organized awareness campaign.

Physical characteristics: (G. Pratesi, UniFi; R.J. Macke, Specola Vaticana): a very low bulk density (2.87±0.04 g/cm3) combined with a high porosity (18±2 vol%).

Petrography: (G. Pratesi, T. Cuppone, UniFi; M. Patzek, IfP): Two polished thin sections were analyzed. The sample exhibits a brecciated chondritic texture with several well-defined chondrules. The meteorite is characterized by high porosity indicated by abundant irregular voids. It contains porphyritic, barred, granular, and cryptocrystalline chondrules. The meteorite mainly consists of olivine and low-Ca pyroxene (orthopyroxene), as well as plagioclase (>2 µm in size), high-Ca pyroxene, Fe-Ni metal (kamacite and taenite), tetrataenite, troilite, phosphates (Cl-apatite and merrillite), and oxides (chromite). The shock effects within individual components and chondrules are highly variable, ranging from unshocked (S1) to moderately shocked (S4). The fusion crust is present in many samples, but none is completely crusted.

Geochemistry: (G. Pratesi, T. Cuppone, UniFi; R. Greenwood, I. Franchi, OU): Mineral composition has been obtained by Electron Microprobe analyses. Olivine Fa18.01±0.33 (N=60); Orthopyroxene Fs16.99±0.31Wo1.17±0.64 (N=37); High-Ca Pyroxene Fs6.59±1.19Wo43.62±4.88 (N=15); Plagioclase An12.1Ab83.3Or4.5 (N=11); Sulfide: Ni <0.5 wt%. Kamacite with Ni in the range 5.3-6.4 wt% (N=7). Chromite Mg# 0.15, Cr# from 0.84. Oxygen isotope analyses on two different samples yielded the following mean values: δ17O 2.75, δ18O 4.04, Δ17O 0.65 (all ‰).

Classification: (G. Pratesi, T. Cuppone, UniFi; M. Patzek, IfP): Ordinary Chondrite, monomict H5 breccia, C-S1, W0. This classification is based on the following criteria: (1) olivine Fa composition is restricted in the range 17.4-19.1; (2) the low-Ca pyroxene (70 grains analyzed by EBSD) is orthorhombic; (3) deviation of olivine analyses from the average is <5%; (4) chondrules have well-defined boundaries and are clearly visible in the investigated thin sections; (5) since the shock stage of a bulk breccia is defined by the shock degree of the clast that experienced the lowest shock degree, bulk Matera has a shock degree of C-S1; (6) since no oxidation is visible, the weathering stage is W0.

Specimens: Two specimens (13.48 and 17.06 g) showing a partial fusion crust and other little fragments (6.18 g in total), two polished mounts, and two polished thin sections are at MSP (Italy) where director M. Morelli takes care of them. The status of the main mass (46.21 g) and other stones (87 g in total) remains to be decided by landowners. The total recovered mass is 117.5 g.

Bibliography:
  • Gardiol D., Barghini D., Buzzoni A., Carbognani A., Di Carlo M., Di Martino M., Knapic C., Londero E., Pratesi G., Rasetti S., Riva W., Salerno R., Stirpe G. M., Valsecchi G. B., Volpicelli C. A., Zorba S., Colas F., Zanda B., Bouley S., Jeanne S., Malgoyre A., Birlan M., Blanpain C., Gattacceca J., Lecubin J., Marmo C., Rault J. L., Vaubaillon J., Vernazza P., Affaticati F., Albani M., Andreis A., Ascione G., Avoscan T., Bacci P., Baldini R., Balestrero A., Basso S., Bellitto R., Belluso M., Benna C., Bernardi F., Bertaina M. E., Betti L., Bonino R., Boros K., Bussi A., Carli C., Carriero T., Cascone E., Cattaneo C., Cellino A., Colombetti P., Colombi E., Costa M., Cremonese G., Cricchio D., D’Agostino G., D’Elia M., De Maio M., Demaria P., Di Dato A., Di Luca R., Federici F., Gagliarducci V., Gerardi A., Giuli G., Guidetti D., Interrante G., Lazzarin M., Lera S., Leto G., Licchelli D., Lippolis F., Manca F., Mancuso S., Mannucci F., Masi R., Masiero S., Meucci S., Misiano A., Moggi Cecchi V., Molinari E., Monari J., Montemaggi M., Montesarchio M., Monti G., Morini P., Nastasi A., Pace E., Pardini R., Pavone M., Pegoraro A., Pietronave S., Pisanu T., Pugno N., Repetti U., Rigoni M., Rizzi N., Romeni C., Romeo M., Rubinetti S., Russo P., Salvati F., Selvestrel D., Serra R., Simoncelli C., Smareglia R., Soldi M., Stanga R., Strafella F., Suvieri M., Taricco C., Tigani Sava G., Tombelli M., Trivero P., Umbriaco G., Vairetti R., Valente G., Volpini P., Zagarella R. and Zollo A. (2020) Cavezzo, the first Italian meteorite recovered by the PRISMA fireball network. Orbit, trajectory, and strewn-field. Monthly Notices of the Royal Astronomical Society 501, 1215–1227. (link)
  • Pratesi G., Moggi Cecchi V., Greenwood R. C., Franchi I. A., Hammond S. J., Di Martino M., Barghini D., Taricco C., Carbognani A. and Gardiol D. (2021) Cavezzo—The double face of a meteorite: Mineralogy, petrography, and geochemistry of a very unusual chondrite. Meteoritics & Planetary Science 56, 1125–1150. (link)
Data from:
  MB113
  Table 0
  Line 0:
State/Prov/County:Basilicata
Origin or pseudonym:Matera
Date:2023 Feb 14
Latitude:40°41.7302'N
Longitude:16°35.0663'E
Mass (g):117.5
Pieces:many
Class:H5
Shock stage:C-S1
Weathering grade:W0
Fayalite (mol%):18.01±0.33 (n=60)
Ferrosilite (mol%):16.99±0.31 (n=37)
Wollastonite (mol%):1.17±0.64 (n=37)
Magnetic suscept.:5.42
Classifier:G. Pratesi, T. Cuppone (UniFI); A. Bischoff, M. Patzek (IfP); R.J. Macke (Specola Vaticana); R. Greenwood, I. Franchi (OU)
Type spec mass (g):36.72 (four pieces)
Type spec location:MSP
Main mass:MSP
Finder:Gianfranco Losignore, Pino Losignore, Carmelo Falco, Pierluigi Cox, Silvia Padilla
Comments:Submitted by G. Pratesi
Plots: O isotopes:  
Institutions
   and collections
IfP: Institut für Planetologie, Wilhelm-Klemm-Str. 10, 48149 Münster, Germany (institutional address; updated 23 Jan 2012)
MSP: Museo di Scienze Planetarie, Via Galcianese 20/H, 59100 Prato, Italy, Italy; Website (institutional address; updated 22 Oct 2022)
OU: Planetary and Space Sciences Department of Physical Sciences The Open University Walton Hall Milton Keynes MK7 6AA United Kingdom, United Kingdom (institutional address; updated 8 Dec 2011)
UniFi: Università degli Studi di Firenze, P.zza S. Marco, 4 - 50121 Firenze, Italy (institutional address; updated 14 Sep 2013)
Catalogs:
References: Published in Meteoritical Bulletin, no. 113, in preparation (2024)
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Geography:

Italy
Coordinates:
     Recommended::   (40° 41' 44"N, 16° 35' 4"E)

Statistics:
     This is the only approved meteorite from Basilicata, Italy (plus 1 unapproved name)
     This is 1 of 47 approved meteorites from Italy (plus 23 unapproved names)
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