Krantz Catalog

"12. Identical to the previous crystal form with twinning (Fig. 198)."

Mineral Name:   Albite (also Kumdykolite)

[see Model 10]

Color                               White, gray, blueish, greenish, reddish
Crystal system                  triclinic
Cleavage                          perfect on {001}, very good on {010}, imperfect on {110}
Fracture                           uneven to conchoidal
Mohs scale hardness        6 - 6.5
Luster                              Vitreous
Streak                             White
Specific gravity                2.61 - 2.63

Figure 197 - no wooden model in the collection

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Models 10, 11, and 12 are all the mineral Albite.  I don't read German, but it appears from "Physikalische Krystallographie" that in Model 11 the angle between planes "c" and "b" is 86 degrees (likewise between "c" and "b", and other planes - check the figure).  I can't seem to make KrystalShaper draw planes open "upward".
Also, it seems that Model 12 is identical to Model 11 except for the twinning.  I tried to indicate this with the stripe to match the wooden model.   Notice that the stripe on the model is placed asymetrically.