Re: pinhole Epsom salt crystals

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From: Paul Doherty (pauld@exploratorium.edu)
Date: Mon Mar 07 2005 - 19:03:52 PST 

Message-Id: <B379DEAE-8F7E-11D9-9AFA-000A95B38012@exploratorium.edu>
From: Paul Doherty <pauld@exploratorium.edu>
Subject: Re: pinhole Epsom salt crystals
Date: Mon, 7 Mar 2005 19:03:52 -0800

Hi Treena

Yes crystals are complicated.

Snow flakes all have hexagonal symmetry.

The symmetry refers to the angles between the faces of the crystals.
But many shapes can be constructed from the same angles.

Paul D

On Mar 7, 2005, at 5:00 PM, Treena Joi wrote:

>
> I am trying to allow students to explore salts ... and in my research,
> am finding a variety of descriptors for salts.
>
> cubic salts are easily evident when they crystallize by evaporating in
> a small dish
>
> but epsom salts, and other salts seem more complicated
>
> I see descriptors of crystal shape referring to 7 crystal shapes, yet
> superficially I see other forms not explained so easily.
>
> I see cubic, tetragonal, hexagonal, orthorhombic, monoclinic,
> triclinic, trigonal ... in references to geometric crystal shapes
>
> but see different forms in the salts I observe.
>
> Any help out there?
>
> I am observing epsom salts and am looking for descriptors there
> especially and only at a 5th grade level
>
> I am so turned around looking for this I keep typing slats instead of
> salts - how funny is that?
>
> Like a typing twitch! (teacher humor)
>
> Thanks for any help available
>
> Treena Joi
>
>
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