APATITE, M-75A. Cost J-N. Canada. Green to brown crystal prism sections.
Pieces of prisms showing some faces and some complete crystals.  Good for hard-
ness testing. 1-1.5 inch.  class pack of 20 - $15.  

Great for teaching hardness properties and crystal properties.
(The Cost J-N is based on size, quality and completeness of crystal.  For example,

a Cost N apatite crystal will be larger, more complete, have better luster, etc., than Cost J.  So if

quality is an issue, check with us - paying a little more may guarantee the crystal form, luster, etc.)

ARAGONITE, M-80. Cost I. California. Nearly
white to yellow, acicular to columnar masses.
Class pack of 20 - $25.00.  Some larger sizes available.

ARSENOPYRITE, M-85. Cost N. Utah. Coarse
grain, nearly pure. Gray metallic. Only small pieces presently available. A few larger.

Inquire.

ASBESTOS, see CHRYSOTILE.

ASTROPHYLLITE, M-90. Colorado.
Thin, brass colored blades in rock . . . 2"x3"
largest. Check for availability - very limited

AUGITE M-95. Cost L. Canada. Greenish
black pyroxene. Will or can be broken to show
the cleavage. Some residual  iron staining. Class pack of 20 showing cleavage - $25.

AZURITE, M-100. Larger sizes price based on quality.
Azurite coating and impregnating limonite. May be
associated with other minerals. Best quality available.

Class pack of 20 - $25.00.  Presently from China - beautiful.  Almost  pure with minor limonite. 

Great for streak test. 

AZURlTE, M-100A. Other locations - check for availability

BARITE, M-105. Cost J. Missouri. White, platy
masses with some iron oxide staining. Package of 10 - $20. Check.

BARITE, M-105A.  Nevada.
White to gray or brown, medium to fine
Grain Sugary- masses. Package of 10  - $14.

BARITE, M-105B. Cost D. Nevada.
Dark gray to black, medium to fine.  Grain. Package of 10 - $20.

BASTNAESITE, M-110. Cost N.
California. Flesh to reddish masses from
1 to over 3 mm in carbonatite rock. Class pack of 20 - $25.00. Check for availability. OOS

BAUXITE, M-115. Cost I. Arkansas. Gray,
red, brown or buff, pisolitic masses. Class pack of 20 - $25.  

A basic ore of aluminum, a good choice to teach about minerals as ores.  You can

see flecks of aluminum in most pieces.

BENTONITE, see MONTMORILLONITE

BERYL, M-120. South Dakota.
White to yellowish masses. Some brown
iron stain on fracture lines. Class pack of 20 - $25.

BIOTITE MICA, M-125. Cost H. Canada.
Black, vitreous cleavage mica books.

1x2 inch size and up are the only sizes of Biotite available at 

this time. All the 1x2 inch size are at least 3/8 inch or 1cm thick. 
  

Also see muscovite mica.  Several of our granites contain biotite as a 

rock-forming mineral.  (For example, IG-70O; IG70G; a couple others,

ask if interested, also some pegmatites.)

BORAX (TINCAL), M-130. California. Glassy, 

colorless medium to coarse grain crystalline. Superficially
altering to white tincalconite. Class pack of 20 -
$25.00.  Also see Kernite.    Check

BORNITE, M-135. Cost J. Flambeau mine, Wisconsin.
Rich, nearly pure iridescent masses with
minor occasional pyrite. Class pack of 20 - $20.00

BORNITE, M-135B. Cost N. Flambeau mine, Wisconsin.

Botryoidal to sub-crystalline masses. Good collector specimens

as well as a rare opportunity for the student to observe. 

This bornite represents classic chemical weathering. 

An environment of supergene enrichment with a 

fluctuating water table enabled this type of bornite to be form.

Limited supply, the Flambeau mine is closed and has been

completely reclaimed.  Individually priced.

BOULANGERITE, M-140. 
Washington. Nearly pure, gray metallic
masses. Class pack of 20 - $25.  SL.