The mouse-over information for Dark Glitter, when seen at least in these circumstances, is false:

- Within the System View

- The planet or system is uncolonized

The mouse-over information indicates that Dark Glitter, when used within a System Upgrade, offers the following bonuses: +2 science per pop, +1 industry per pop. 

When zoomed out to the galaxy view, the information is displayed correctly.

onomastikon wrote:

The mouse-over information indicates that Dark Glitter, when used within a System Upgrade, offers the following bonuses: +2 science per pop, +1 industry per pop.

The effect you refer to, is the bonus per population you get on planets having Dark Glitter ressource.

Yes, I know. The UI wrongly explains that this is the system upgrade bonus. 

Source locations:

ResourceDepositDefinitions.xml

 <ResourceDepositDefinition Name="LuxuryDeposit7" SubCategory="Luxury" Rarity="Common" Family="Defense" LinkedResource="Luxury7">
<SimulationDescriptorReference Name="ResourceLuxury7"/>
<SimulationDescriptorReference Name="ResourceTypeLuxury"/>
<SimulationDescriptorReference Name="ResourceRarityUncommon"/>
</ResourceDepositDefinition>

    SimulationDescriptors[ResourceDeposit].xml

<SimulationDescriptor Name="ResourceLuxury7" Type="ResourceLuxury">
<Modifier TargetProperty="Luxury7" Value="$(DepositValue)" Operation="Addition" Path="./ClassPlanet" TooltipHidden="true"/>
<Modifier TargetProperty="PlanetInitialSciencePerPopulation" Value="2" Operation="Addition" Path="./ClassPlanet"/>
<Modifier TargetProperty="PlanetInitialIndustryPerPopulation" Value="1" Operation="Addition" Path="./ClassPlanet"/>
</SimulationDescriptor>