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DESCRIPTIVE MINERALOGY.

Genus 3. Aluminus.H=5. G=2.7—2.8.

Sp.

Sp.

1 .

A. rhombohedrus,

Alum Stone.

Genus 4.

Fluelles.

H=4—5.5.

G=2.9—3.4.

1 .

F. pyramidalis,

Fluellite.

2.

F. octahedrus,

Fluor Spar. ~

3.

F. liexagonus,

Apatite.

4.

F. obliquus,

Wagnerite.

5.

F. rhombicus,

Herderite.

6.

F. Childrenii,

Childrenite.

Genus 5. Astrales.*

H=3.5—4. G=2.3—2.4. Mostly stellularly and hemispherically columnar.

Sp. 1. S. rhombicus, Wavellite.

Genus 6. Gypsales.!

H—1.5—3.5. G=2.3—3. One or more cleavages very perfect and easily obtained.

Contain lime.

Sp. 1. G. stellatus,

2. G. rhombicus,

3. G. rhomboideus,

4. G. rectangulus,

5 5. G. Cobalticus,

/. 6. G. fusilis,

Pharmcicolite.

Ilaidingerite.

Gypsum. —

Anhydrite.

Roselite.

Hydroboracite.

Genus 7. Calcius.I

H=?2.5—-4. G=2.5—3.3. Contain lime.

Sp. 1. C. rhombohedrus,

2. C. rhombicus,

3. C. Dolomaei,

4. C. decolorans,

Calcareous Spar. ■Arragonite.Dolomite.Ankerite.

Genus 8. Magnesialus.

1

Sp.

1 .

2 .

3.

H=1— i.5. G=2.5—3.2. Contain magnesia.

M. rhombohedrus,M. fibrosus,

M. pulvereus,

Rhomb Spar .

Alagnesite.

Hydromagnesite.

* ’ A ctoov, a star.

+ Thirds lime, and SXs salt,t Calx, lime.