Hohenlohe Flintstone

This stone can be found  next to our door!  Quite unspectular in the field ...but cutting reveals a colorful inside!

Synonyms:  Jasper,
Variety of:  microcrystalline and cryptocrystalline chalcedony and quartz
IMA Status:  Not recognised as mineral
Classification:  Oxides
Chemical formula:  SiO2
Crystal system:  Trigonal - microcrystalline, cryptocrystalline
Density (g/cm3):  2,6 - 2,9 measured
Tenacity:  Brittle
Cleavage:  Non observed
Fracture:  Conchoidal, sub-conchoidal
Hardness (Mohs):  6,5 - 7
Colour:  Rot, rot-brown, brown, grün, gelb, yellow, white but black too, any color due to embedded minerals
Lustre:  Vitreous, waxy, dull
Streak:  White
Application:  Local famous as a gemstone