Talk:Chalk

Anome, while you're at it, would you please link chalk to the hardness scale? As in, diamond (#10) can scratch substance #9, and so on... Ed Poor

Could some of the places where chalk rock is found be moved to Downland? --Steinsky 13:55, 13 Aug 2003 (UT

Curious that statement about chalk for drawing not really being chalk but gypsum. If you pick up a lump of natural chalk it writes on blackboards and slates and other surfaces perfectly well and looks and feels exactly like chalk in sticks.... so is that statement actually true? Graham 06:19, 29 Jan 2004 (UTC)

I've picked up quite a few lumps of natural chalk, and they were all a lot harder than blackboard chalk! --Steinsky 19:24, 29 Jan 2004 (UTC)

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Doesn't chalk come from calcite producing sea plankton - should this be mentioned?

Cue chalk

Chalk is also used on the tips of cues to play pool/billiards. 70.111.251.203 00:39, 26 February 2006 (UTC)

Picture

Just wondering if it's necessary to mention that the school chalk is french. It seems kind of awkwardly placed. ^_^ Whatcanuexpect 21:17, 5 June 2006 (UTC)

Chemical Composition

is chalk a salt? because i read a book saying it is so but my teacher disagree\-from aldeen of sci-tech -- 06:33, 31 July 2006 58.69.61.146

tailor's chalk

I thought tailor's chalk was softer than blackboard chalk? --Gbleem 04:08, 31 October 2006 (UTC)

Liquid chalk

I'm in Korea and they have this marker like thing that they fill with liquid chalk. Anyone know anything about it? I think they use it on a regular blackboard. --Gbleem 04:09, 31 October 2006 (UTC)

Chalk the mineral vs. Gypsum

I think the article needs to separate the two meanings of the word chalk better. I think there should be an article about common chalk that mentions that one of the minerals used is the mineral chalk and then have a Chalk (mineral) article. --Gbleem 00:22, 3 November 2006 (UTC) I like pie!

Chalk in Russia and Ukraine

There are large chalk deposits in Belgorod Oblast, Russia and north-east Ukraine. http://vigourik.livejournal.com/24361.html this is just one mine... Solarapex 05:45, 13 May 2007 (UTC)

What is it mined for? Presumably crushed to make lime for cement etc? --Zamphuor 06:05, 13 May 2007 (UTC)

That's about right. Plus it is used for producing paint (white color pigment), whitewash, as a component in paper, toothpaste. Other uses include purifying beet juice when producing sugar. It is also used for writing on blackboards (markers and whiteboards are not widely used in the former USSR). Solarapex 17:12, 13 May 2007 (UTC)

Chalk and Sewing

It seems to me that the connection between chalk and sewing it not significant enough to merit the sewing box at the bottom of the article. I see no mention of chalk in the sewing box, and it seems out of place. I will remove it in a few days unless there are objections. StevenBell (talk) 22:09, 8 March 2008 (UTC)

The Champagne Caves

I have reworded this section to make it clear the caves around Rheims are artificial. Chalk can host small natural caves (e.g. as at Beachy Head), and the previous wording could be interpreted as indicating that the Champagne wine cellars are natural. Some of them have been tunnelled out for the purpose of storing wine, others are adapted from disused chalk mines.--Langcliffe (talk) 14:56, 7 October 2008 (UTC)

Agricultural chalk's chemical composition

@"In agriculture chalk is used for raising pH in soils with high acidity. The most common forms are CaCO3 (Calcium carbonate) and CaO (Calcium Oxide)."
- Chalk, being "composed of the mineral calcite", which consists chemically of Calcium carbonate, can't have Calcium oxide as a "form". -- 91.49.198.156 (talk) 02:37, 23 February 2009 (UTC)

Cement

I'm no expert, but shouldn't the section on 'uses' mention cement? I thought this is (or was) the major use of chalk. In England, anyway, there are huge disused chalk quarries in Kent and Essex which used to supply the cement industry.86.181.208.209 (talk) 16:43, 7 March 2010 (UTC)

Vandalism/disruption

There has been quite a bit of vandalism on this article over the past 1-2 weeks. I might consider requesting semi-protection if it keeps up... Immunize (talk) 15:22, 28 April 2010 (UTC)

Niobrara/paleontology

The article gives the impression that chalk deposits occur only in Europe. It should discuss other chalks, such as the Niobrara Chalk of the western interior of North America. Mention also should be made of fossils found in chalk, particularly the marine reptiles.  ::—Preceding unsigned comment added by 66.188.86.246 (talk) 06:10, 9 May 2010 (UTC)

Plaster of Paris

Blackboard chalk/sidewalk chalk or whatnot can also be made out of plaster of paris. —Preceding unsigned comment added by 199.204.125.3 (talk) 02:37, 4 November 2010 (UTC)

Cleanup

I added the cleanup tag, because I felt that the importance of this article should be increased, and thus the quality of its content would (imho) require improvement. The Cretaceous chalk deposits of England and France are an example of a major geological carbon-sink, and is important in an understanding of global warming.Davidc (talk) 17:16, 18 February 2012 (UTC)

Sports

Why are you calling magnesium carbonate chalk? — Preceding unsigned comment added by 85.230.21.148 (talk) 12:29, 14 October 2012 (UTC)