David Weir: Meteorite Studies

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Pluto Walk, Lowell Observatory

This photo was taken September 1990 in Flagstaff, Arizona during a chance meeting between Doug [...]

TENERE-1 (Provisional)

CR7 or Meta-CR (CR-like in MetBull 86; CR-an in MetBull DB) Found March 2000, 20 [...]

ALMAHATA SITTA ORGANICS

As with other ureilites, Almahata Sitta falls on the carbonaceous chondriteCarbonaceous chondrites represent the most [...]

NWA 1912

MesosideriteOne of two main types of stony-iron meteorite, the other being pallasites. Mesosiderites are a [...]

Denshal Dog Data: Is the Nakhla Dog Real?

Separating Myth from Fact: Is the Nakhla Dog Real? A Personal Analysis By David Weir [...]

Auburn

Iron, IIAB: Compositionally related to group IIG Found: before 1867, Coordinates: 32 ° 37′ N., [...]

Landes (placeholder)

Coming Soon

Systematics: Lunar Rock Classification

International Union of Geological Sciences Subcommission on the Systematics of Igneous Rocks (2001) I. SEDIMENTARY [...]

COPYRIGHT

Many people think U.S. copyright law was created just to protect those who hold the [...]

Desert Varnish

DESERT VARNISH This widespread desert phenomena has been considered by some to be a biogeochemical [...]

NWA 7475

NORTHWEST AFRICA 7475 click on photos for a magnified view

Bellsbank Quintet: A New Iron Group

THE BELLSBANK QUINTET: The Consummation of a New Iron Group—IIG The five iron meteorites displayed [...]

Martian Meteorite Ejection Ages

MARTIAN METEORITE EJECTION AGES Diagram credit: R. R. Mahajan, 46th LPSC, #1166 (2015) Diagram credit: [...]

Pneumatolytic Process

PNEUMATOLYTIC METAMORPHISM ‘Instead of the formation of the vugs through an igneous process, i.e., by [...]

Meteorite Studies: Introduction

METEORITES: A Systematic Classification Through Photographs By David Weir (Updated regularly since May 1997) “Where [...]

Methods for Dating the Age of Meteorites

Methods of Dating the Age of Meteorites Meteorites are among the oldest objects we know [...]

Systematics: Enstatite Chondrites – Subgroup Classification

PART I: CHONDRITES, METACHONDRITES PART II: PRIMITIVE ACHONDRITES, ACHONDRITES, STONY-IRONS, IRONS PART III: MARTIAN METEORITES—GEOCHEMICAL [...]

Udei Station

Iron, IAB complex, Udei Station grouplet Fell spring 1927 7° 57′ N., 8° 5′ E. [...]

Toluca

Iron, IAB complex, sLL subgroup Found 1776, known earlier 19° 34′ N., 99° 34′ W. [...]

Sutter’s Mill

CM2.0/2.1 chondriteChondrites are the most common meteorites accounting for ~84% of falls. Chondrites are comprised [...]

Saint Sauveur

EH5 Impact-melt brecciaWork in Progress ... A rock that is a mechanical mixture of different [...]

NWA 7135

F3/4 (forsterite chondriteForsterite Chondrites or F-Chondrites are presently only known as inclusions in other meteorites [...]

NWA 5958

C2-ungrouped (CM-like) (C3.0-ung [2012], C2-ung in MetBull 99) Purchased September 2009 Numerous fragments of a [...]

NWA 3329

DiogeniteDiogenites belong to the evolved achondrite HED group that also includes howardites and eucrites. They [...]