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8 minutes ago, adam said:

Siderite?, Is that something to do with iron?  First thing I thought was calcite or maybe barite.

Iron Carbonite. Not heavy enough for barite i don't think. No noticable reaction to vinegar that I would expect from calcite. 

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Well considering the host rock appears it may be loadstone and quartz is it magnetic? AzNuggetBob

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Place a drop of weak acid on a sample of the brown mineral.  Calcite will fizz, Siderite will not fizz with the addition of a weak acid.

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6 hours ago, 4meter said:

Place a drop of weak acid on a sample of the brown mineral.  Calcite will fizz, Siderite will not fizz with the addition of a weak acid.

No strong reaction to the vinegar. Not that I would expect from calcite

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Warm the vinegar in the microwave then place  a drop on the sample.  Warm vinegar will react when in contact with Calcite.

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