HaH 180 | agglomeration of particles, many of which record individual, diverse histories | which depends on its composition | in volume % | in weight % | very weakly shocked | during meteor phase | oldest and most primitive rock in solar system | S2 | in volume % | it fragments because smaller pieces with less mass are more easily slowed by the atmosphere | S2 shock stage chondrite | size is between 3 micrometers and 3 millimeters | usually plagioclase tectosilicate | during meteor phase which depends on composition | in weight % | crater | Hammadah al Hamra | recorded by eyewitness or inferred from dating methods | shock metamorphism | | providing insight into geological evolution of parent asteroid | HaH 180 | orthopyroxene for enstatite chondrite | the nature and degree of thermal metamorphism or aqueous alteration | undulatory extinction, irregular fractures | | | can be severe due to long exposure time to environmental corrosion agents | before, during or after other types of metamorphism | W4 | definition goes here | HaH | in volume % | 85.7 % of meteorite falls | during impact phase | | small sphere of about 1 mm diameter of formerly melted minerals | lower because the fall was not witnessed | 27 kg | definition goes here | when it hits the ground which is smaller than its velocity before it enters the atmosphere | less than 950 degree Celsius during its entire history since solidification | undulatory extinction, irregular fractures | undulatory extinction, irregular fractures, some planar fractures | asteroid smaller than 100 km in diameter | fine grained disequilibrium mixture of silicates, oxides, metal, sulfides and organic constituents | in volume % | which depends on degree of aqueous alteration and thermal metamorphism | 28° 36.21' N., 13° 18.04' E. | in weight % | often minerals not found on Earth | large if the fall was witnessed | which can over an order of magnitude greater than total mass of fragment(s) collected at the impact site | | April 1996 | in weight % | 0.936 kg |
 | meteoroid from interplanetary space or fragment dislodged from another planet, moon or planetesimal | 3 | directly proportional to initial velocity | power outages and failures in electrical equipment due to EMP (electromagnetic pulse) | 5 to 10 GPa | millimeters | | which appears as an elongated footprint which depends on impact angle, airbursts, and impact velocity |