Rarity from the old Southern German collection
Archives Prehistoric Europe!
Rock created or modified by the impact
of the famous Ries Meteorite - Nördlinger Ries in Southern Germany!
Weight is around 323 grams. Length is 101 mms.
The blue spots are modern paint and can be removed.
Rocks that have been produced in a meteorite impact process like impact melt rocks, suevites and various impact breccias. In the broader sense and frequently used  on the commercial level (shops, ebay etc), impactites comprise all items related  with meteorite impacts such as impact glasses, tektites, shatter cones,  pseudotachylites and even samples from the K/T boundary and rocks  that may possibly have formed in an impact.
Nördlinger Ries (Wikipedia):
The depression is a meteorite impact crater formed
about 14.3 million–14.5 million years ago in the Miocene.
The crater is most commonly referred to simply as the Ries or Ries crater.
The original crater rim had an estimated diameter of 24 kilometers (15 mi).
The present floor of the depression is about 100 to 150 m
(330 to 490 ft) below the eroded remains of the rim.
It was originally assumed that the Ries was of volcanic origin.
In 1960 Eugene Shoemaker and Edward C. T. Chao showed that the
depression was caused by meteorite impact. The key evidence was the
presence of coesite, which, in unmetamorphosed rocks, can only be
formed by the shock pressures associated with meteorite impact.
The coesite was found in the locally derived suevite building stone of the
Nördlingen town church.The suevite was formed from mesozoic
sediments shocked by the bolide impact.
The Ries impact crater as a rampart crater,
which is thus far a unique finding on Earth.
  Rampart craters are almost exclusively found on Mars.
Rampart craters exhibit a
fluidized ejecta flow after impact of the meteorite,
most simply compared to a bullet fired into mud,
with the ejecta resembling a 'mudflow'.
I guarantee absolutely for the authenticity.
Please view also my other listings with relics
from the  European Prehistory.