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DESCRIPTIVE MINERALOGY.

ORDER IV. OSMERINEA.

Genus 1. IIydrolus.*

/ o 6!0 [

■ O'

II -1—3.5. G=1.4—2.1.Sp. 1. H. cerinus,t

2. H. argilliformis,

3. H. adhaerens,

4. H. pyrosmicus,+

5. H. Gibbsianus,

6. H. tinctus,

Fusion difficult — infusible.

Halloylite.

Kollyrite.

Scarbroitc.

Pyrnrgillite.

Gibbsite.

Allophane.

Genus 2. Ophitis.s

/:•

H=2—4.

Sp. 1. O. communis,

2. O. figularis,

3. O. reniformis,

G=2.5—2.9.

Serpentine.

Agalmatolite.

Kerolite.

Genus 3. Stylus. II

H=2—3. G=2.6—2.8. hi prisms of six or twelve sides.

Sp. 1. S. hexagonus, Pinite.

2. S. acrotomus, Fahlunite.

Genus 4. Nematus.H

Sp. 1.

2 .

.• (a 3.

H=2—3. G=2.3—2.7.

N. rectangulus,

N. scopiformis,

N. gracilis,

Delicately columnar.

Picrosmine.

Osmelitc.

Nemalite.

Genus 5. Margaritus.**

H=1.5—3. G=2—3.1. Lamellar.

Sp. 1. M. Magnesicus, Native Magnesia.

2. M. saponaceus, Talc.

* 'rlwp, viater ; refers to the large proportion of water in the species,t Waxy , in allusion to its lustre,t IUp , fire, and 6odor.

§ An old name of serpentine, derived from the Greek, frpit, a snake.

II SniXos, a column, in allusion to the hexagonally prismatic forms presented bv thespecies.

IT Nppa, a thread ; refers to the columnar structure of the species.

** Mapyaphrjs, pearl ; alludes to the lustre.