The red-violet pieces in this mix are not henna.  They are Myrobalan.  The exporter admitted that what was shipped as 100% pure henna, was in fact mixed with myrobalan, but told the purchasere "not to worry, because it was all natural".

Myrobalan \My*rob"a*lan\ (?), Myrobolan \My*rob"o*lan\ (?), ] n. [L. myrobalanum the fruit of a palm tree from which a balsam was made.  A dried astringent fruit much resembling a prune. It contains tannin, and was formerly used in medicine, but is now chiefly used in tanning and dyeing. Myrobolans are produced by various species of Terminalia of the East Indies, and of Spondias of South America.
  -- web1913

myrobalan n : small Asiatic tree bearing edible red or yellow fruit; used in Europe as budding stock [syn: cherry plum , myrobalan plum , Prunus cerasifera ]
  -- wordnet

Some green dye observed.
Plant material other than henna observed (Myrobalan)
No grit crunched against glass when microscope slides rubbed together
Larger particles may clog metal tips. 

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