mineral specimens
rare minerals
mineral dealer
systematic minerals
Black Hills minerals
fine minerals
mineral dealer
Dana minerals
IMA minerals
mineral collections
rock and minerals
gem crystal
Checkout
0 item @ $0.00  
Home | My Cart | Login | Register

Vermiculite

#AH54186
SOLD
Vermiculite from Easton Talc quarry, Northampton Co., Pennsylvania, United States - AH54186
Vermiculite from Easton Talc quarry, Northampton Co., Pennsylvania, United States - AH54186

Vermiculite

#AH54186
Availability
Sold
Size
8 x 6 x 6 cm - Sm Cabinet 
Formula
Mg0.7(Mg,Fe3+,Al)6(Si,Al)8O20(OH)4·8H2O (RRUFF)
Locality
Easton Talc quarry, Northampton Co., Pennsylvania, United States

Small to large (4cm), yellow plates of micaceous Vermiculite.

Although a monoclinic phyllosilicate, Vermiculite is not a mica group member. But it  is micaceous. It is a member of the Montmorillonite-Vermiculate group with 2:1 layering, meaning there are two (T) tetrahedral layers with an (M) octahedral layer in between. There is no (I) interlayer and the 2:1 layers are instead held together by weak Van der Waals bonds.

Vermiculate requires Biotite, Chlorite, Hornblend and Serpentines to form. Vermiculite contains so much water it will exfoliate when burned.

Vermiculite

Formula
Mg0.7(Mg,Fe3+,Al)6(Si,Al)8O20(OH)4·8H2O 
Crystal System
Monoclinic 
Crystal Habit
Lamellar, Scaly 
Cleavage
Perfect, None, None 
Luster
Vitreous - Dull 
Color
colorless, green, gray white, yellow brown 
Streak
greenish white 
Class
Monoclinic - Prismatic 
Fracture
Uneven 
Hardness
1.5-2 

Data courtesy of Webmineral.

Collection
Arnold G Hampson Collection
Mineralpedia
View Vermiculite
On Dakota Matrix
Previously Sold Vermiculite
On Dakota Matrix
Other Available Vermiculite
WebMineral
View Vermiculite
Mindat
View Vermiculite

Other Sold

All photos by Dakota Matrix and are Copyrighted © and may not be used without permission. Copyright © 2025 - Dakota Matrix Minerals, Inc. Privacy | Terms & Conditions | Site Map