"Kindergarten" as weary euro ministers divide over Greece

* Tempers fray after months of repeated abortive talks

* New Greek minister calm at eye of storm

* Germans, French work to contain divisions

* Rift spreads across Europe, including within governments

By Jan Strupczewski and Alastair Macdonald

BRUSSELS, July 12 (Reuters) - Caught between the rock of throwing good taxpayers' money after bad in Greece and the hard place of opening a dangerous crack in their common currency, tempers are fraying among euro zone ministers meeting in Brussels.

So heated did arguments become after nine hours of their sixth emergency council in three weeks that the chairman called a surprise halt just before midnight on Saturday in the hope talks which resumed on Sunday could proceed with clearer heads.

"It was crazy, a kindergarten," said a source familiar with the arguments in the Eurogroup among increasingly weary finance ministers. "Bad emotions have completely taken over."

Unlike many of a dozen previous meetings they have had since Greeks despairing of creditor-imposed austerity elected leftist Prime Minister Alexis Tsipras in January, some of the sharpest exchanges were not with their Greek colleague but each other.

By contrast, Greek Finance Euclid Tsakalotos, appointed last week in place of the often provocative Yanis Varoufakis, seemed calm and expressed a willingness to take steps to convince creditors Athens could be trusted to implement budget and economic reform measures to unlock tens of billions of euros.

Another official close to the talks said the adjournment was prompted by a particularly heated exchange - on Greece's ability to service its debts - between European Central Bank chief Mario Draghi and German Finance Minister Wolfgang Schaeuble.

In response to Draghi, one participant quoted Schaeuble as saying: "I'm not stupid." The veteran German conservative leads a hardline faction in the talks which warns Greece that it faces ejection from the 19-country euro zone if it does not do much more to earn its third bailout in five years.

France, which along with the European Commission and ECB is warier than many in Germany of allowing a "Grexit" that could undermine faith in the entire currency, has worked with Greek officials to shape their proposals. With Italy, France shares concerns about Greek promises but is concerned Germany, or at least Schaeuble, is too inflexible, euro zone sources said.

One said that after months of frustration with their former Greek counterpart, some ministers were impatient with Schaeuble: "He's switched roles with Varoufakis," the source said.

A Greek official said he feared some in the room had made up their minds to force Athens out of the euro zone. Schaeuble's ministry drafted a paper saying a "time-out" for a few years was the alternative to much more sweeping reforms, though several sources said Schaeuble did not spell that out at the table.