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Talk:Biotite

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This is an old revision of this page, as edited by 129.11.86.22 (talk) at 09:27, 2 September 2015 (Reply to specific gravity and density comment). The present address (URL) is a permanent link to this revision, which may differ significantly from the current revision.

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Untitled

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As mentioned in the headlining message on the page, someone needs to insert inline citations

And can we get ride of the 3rd citation? Thats a CHILD website... with no credentials to boast. I would like to see more appropriate citations from Encyclopaedia Britanica etc.74.222.64.182 (talk) 03:03, 15 September 2008 (UTC)[reply]

Inexpertly, Biotite has the general chemical formula (K Al O2) — (MO Q)3 — W, alloying Mafic oxides, Quartz, Water, to an Orthoclase-like Potassic Aluminum Oxide. 66.235.38.214 (talk) 09:17, 20 October 2012 (UTC)[reply]

Biotite specific gravity 2.7-3.1 vs density 2.8-3.4

How did this difference come to be. True difference or different samples or methods?

I have what I believe to be generic biotite. My specific gravity measurement using water at 1 ATM and 20C gave pretty much exactly 3.33. I am not geologist, but do have a lab with very exact balances. My number is correct. How flexible are these numbers to define biotite? — Preceding unsigned comment added by 79.102.30.85 (talk) 06:58, 31 August 2015 (UTC)[reply]

Reply: Specific gravity and density are different. Density is the mass per volume, and specific gravity is the density of a sample relative to a reference sample. If the question is about the range of reported density and specific gravity measurements, it is due to the chemical heterogeneity of natural samples. Biotite is a solid solution with aluminium, iron, and magnesium end members.

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